diff --git a/App.tsx b/App.tsx
index 93d8edfc..00d68a83 100644
--- a/App.tsx
+++ b/App.tsx
@@ -31,6 +31,8 @@ import ContactDetailScreen from './src/screens/ContactDetailScreen';
 import ContactFormScreen from './src/screens/ContactFormScreen';
 import GroupDetailScreen from './src/screens/GroupDetailScreen';
 import SettingsScreen from './src/screens/SettingsScreen';
+import ScheduledScreen from './src/screens/ScheduledScreen';
+import UnifiedInboxScreen from './src/screens/UnifiedInboxScreen';
 import { useAccountStore } from './src/stores/account-store';
 import { useAuthStore } from './src/stores/auth-store';
 import { useCalendarStore } from './src/stores/calendar-store';
@@ -449,6 +451,8 @@ export default function App() {
           }}
         />
         <Stack.Screen name="GroupDetail" component={GroupDetailScreen} />
+        <Stack.Screen name="Scheduled" component={ScheduledScreen} />
+        <Stack.Screen name="UnifiedInbox" component={UnifiedInboxScreen} />
         <Stack.Screen
           name="AddAccount"
           options={{
diff --git a/src/api/__tests__/contacts.test.ts b/src/api/__tests__/contacts.test.ts
index e159700e..c617756e 100644
--- a/src/api/__tests__/contacts.test.ts
+++ b/src/api/__tests__/contacts.test.ts
@@ -16,6 +16,9 @@ import {
   createContact,
   updateContact,
   deleteContacts,
+  createAddressBook,
+  updateAddressBook,
+  deleteAddressBook,
 } from '../contacts';
 
 const mockRequest = jmapClient.request as ReturnType<typeof vi.fn>;
@@ -117,4 +120,58 @@ describe('contacts operations', () => {
       expect(call[1].destroy).toEqual(['c1', 'c2']);
     });
   });
+
+  describe('createAddressBook', () => {
+    it('creates a book and returns the created entity', async () => {
+      mockRequest.mockResolvedValue({
+        methodResponses: [['AddressBook/set', { created: { 'new-book': { id: 'ab-9' } } }, '0']],
+      });
+
+      const book = await createAddressBook('Work');
+
+      const call = mockRequest.mock.calls[0][0][0];
+      expect(call[1].create).toEqual({ 'new-book': { name: 'Work' } });
+      expect(book).toEqual({ id: 'ab-9', name: 'Work' });
+    });
+
+    it('throws when the server refuses to create', async () => {
+      mockRequest.mockResolvedValue({
+        methodResponses: [['AddressBook/set', { notCreated: { 'new-book': { description: 'nope' } } }, '0']],
+      });
+      await expect(createAddressBook('X')).rejects.toThrow('nope');
+    });
+  });
+
+  describe('updateAddressBook', () => {
+    it('forwards only settable properties', async () => {
+      mockRequest.mockResolvedValue({
+        methodResponses: [['AddressBook/set', { updated: { 'ab-1': null } }, '0']],
+      });
+
+      await updateAddressBook('ab-1', { name: 'Renamed', id: 'should-be-ignored' } as never);
+
+      const call = mockRequest.mock.calls[0][0][0];
+      expect(call[1].update).toEqual({ 'ab-1': { name: 'Renamed' } });
+    });
+  });
+
+  describe('deleteAddressBook', () => {
+    it('destroys the book by id', async () => {
+      mockRequest.mockResolvedValue({
+        methodResponses: [['AddressBook/set', { destroyed: ['ab-1'] }, '0']],
+      });
+
+      await deleteAddressBook('ab-1');
+
+      const call = mockRequest.mock.calls[0][0][0];
+      expect(call[1].destroy).toEqual(['ab-1']);
+    });
+
+    it('throws when destroy fails', async () => {
+      mockRequest.mockResolvedValue({
+        methodResponses: [['AddressBook/set', { notDestroyed: { 'ab-1': { description: 'in use' } } }, '0']],
+      });
+      await expect(deleteAddressBook('ab-1')).rejects.toThrow('in use');
+    });
+  });
 });
diff --git a/src/api/calendar.ts b/src/api/calendar.ts
index 1587a1a4..ae699b15 100644
--- a/src/api/calendar.ts
+++ b/src/api/calendar.ts
@@ -8,8 +8,11 @@ const CALENDAR_EVENT_PROPERTIES = [
   'id', '@type', 'uid', 'calendarIds', 'title', 'description',
   'start', 'duration', 'timeZone', 'showWithoutTime',
   'utcStart', 'utcEnd', 'status', 'freeBusyStatus',
-  'participants', 'alerts', 'recurrenceRules',
+  'participants', 'alerts', 'useDefaultAlerts', 'recurrenceRules',
   'recurrenceOverrides', 'excludedRecurrenceRules',
+  'replyTo', 'organizerCalendarAddress', 'sequence',
+  'locations', 'virtualLocations',
+  'progress', 'due', 'priority', 'percentComplete',
   'links', 'created', 'updated',
 ];
 
@@ -69,38 +72,165 @@ export async function getEvents(ids: string[]): Promise<CalendarEvent[]> {
   return all;
 }
 
+// `sendSchedulingMessages` asks Stalwart to deliver iMIP (RFC 6047) invitation
+// / reply / cancellation emails to participants. We pass it whenever an event
+// has participants so creating/updating/deleting a meeting notifies attendees.
+function setArgs(
+  accountId: string,
+  payload: Record<string, unknown>,
+  sendSchedulingMessages?: boolean,
+): Record<string, unknown> {
+  const args: Record<string, unknown> = { accountId, ...payload };
+  if (sendSchedulingMessages !== undefined) {
+    args.sendSchedulingMessages = sendSchedulingMessages;
+  }
+  return args;
+}
+
 export async function createEvent(
   event: Partial<CalendarEvent>,
   calendarId: string,
+  sendSchedulingMessages?: boolean,
 ): Promise<CalendarEvent> {
   const accountId = jmapClient.accountId;
   const res = await jmapClient.request(
-    [['CalendarEvent/set', {
-      accountId,
+    [['CalendarEvent/set', setArgs(accountId, {
       create: {
         'new-event': { ...event, calendarIds: { [calendarId]: true } },
       },
-    }, '0']],
+    }, sendSchedulingMessages), '0']],
     USING,
   );
-  return res.methodResponses[0][1].created['new-event'];
+  const result = methodResult<{
+    created?: Record<string, CalendarEvent>;
+    notCreated?: Record<string, { description?: string; type?: string }>;
+  }>(res);
+  const created = result.created?.['new-event'];
+  if (!created) {
+    const err = result.notCreated?.['new-event'];
+    throw new Error(err?.description || err?.type || 'Failed to create event');
+  }
+  return created;
+}
+
+// Batch-create many events in one CalendarEvent/set. Returns the number created.
+export async function batchCreateEvents(
+  events: Partial<CalendarEvent>[],
+  calendarId: string,
+): Promise<number> {
+  if (events.length === 0) return 0;
+  const accountId = jmapClient.accountId;
+  const create: Record<string, Partial<CalendarEvent>> = {};
+  events.forEach((e, i) => {
+    create[`evt-${i}`] = { ...e, calendarIds: { [calendarId]: true } };
+  });
+  const res = await jmapClient.request(
+    [['CalendarEvent/set', { accountId, create }, '0']],
+    USING,
+  );
+  const result = methodResult<{ created?: Record<string, unknown> }>(res);
+  return result.created ? Object.keys(result.created).length : 0;
 }
 
 export async function updateEvent(
   id: string,
-  changes: Partial<CalendarEvent>,
+  changes: Partial<CalendarEvent> | Record<string, unknown>,
+  sendSchedulingMessages?: boolean,
+): Promise<void> {
+  const accountId = jmapClient.accountId;
+  const res = await jmapClient.request(
+    [['CalendarEvent/set', setArgs(accountId, { update: { [id]: changes } }, sendSchedulingMessages), '0']],
+    USING,
+  );
+  const result = methodResult<{ notUpdated?: Record<string, { description?: string; type?: string }> }>(res);
+  const err = result.notUpdated?.[id];
+  if (err) throw new Error(err.description || err.type || 'Failed to update event');
+}
+
+export async function deleteEvents(
+  ids: string[],
+  sendSchedulingMessages?: boolean,
 ): Promise<void> {
   const accountId = jmapClient.accountId;
   await jmapClient.request(
-    [['CalendarEvent/set', { accountId, update: { [id]: changes } }, '0']],
+    [['CalendarEvent/set', setArgs(accountId, { destroy: ids }, sendSchedulingMessages), '0']],
     USING,
   );
 }
 
-export async function deleteEvents(ids: string[]): Promise<void> {
+// RSVP to an invitation: patch the participant's participationStatus via a JSON
+// Pointer (RFC 6901) and let Stalwart send the iTIP REPLY (sendSchedulingMessages).
+export async function rsvpEvent(
+  eventId: string,
+  participantId: string,
+  status: 'accepted' | 'declined' | 'tentative',
+  replyTo?: Record<string, string> | null,
+): Promise<void> {
+  const accountId = jmapClient.accountId;
+  // Escape per RFC 6901: ~ → ~0, / → ~1.
+  const escaped = participantId.replace(/~/g, '~0').replace(/\//g, '~1');
+  const patch: Record<string, unknown> = {
+    [`participants/${escaped}/participationStatus`]: status,
+  };
+  if (replyTo) patch.replyTo = replyTo;
+  const res = await jmapClient.request(
+    [['CalendarEvent/set', { accountId, update: { [eventId]: patch }, sendSchedulingMessages: true }, '0']],
+    USING,
+  );
+  const result = methodResult<{ notUpdated?: Record<string, { description?: string; type?: string }> }>(res);
+  const err = result.notUpdated?.[eventId];
+  if (err) throw new Error(err.description || err.type || 'Failed to send RSVP');
+}
+
+// Parse an uploaded .ics blob into one or more JSCalendar events (server-side).
+export async function parseCalendarBlob(blobId: string): Promise<Partial<CalendarEvent>[]> {
+  const accountId = jmapClient.accountId;
+  const res = await jmapClient.request(
+    [['CalendarEvent/parse', { accountId, blobIds: [blobId] }, '0']],
+    USING,
+  );
+  const result = methodResult<{
+    parsed?: Record<string, CalendarEvent | CalendarEvent[]>;
+    notParsable?: string[];
+    notFound?: string[];
+  }>(res);
+  if (result.notParsable?.includes(blobId)) throw new Error('Invalid calendar file format');
+  if (result.notFound?.includes(blobId)) throw new Error('Uploaded file not found');
+  const parsed = result.parsed?.[blobId];
+  if (!parsed) return [];
+  return Array.isArray(parsed) ? parsed : [parsed];
+}
+
+export async function createCalendar(
+  name: string,
+  color?: string,
+): Promise<Calendar> {
+  const accountId = jmapClient.accountId;
+  const res = await jmapClient.request(
+    [['Calendar/set', {
+      accountId,
+      create: { 'new-cal': { name, color, isVisible: true, isSubscribed: true } },
+    }, '0']],
+    USING,
+  );
+  const result = methodResult<{
+    created?: Record<string, Calendar>;
+    notCreated?: Record<string, { description?: string; type?: string }>;
+  }>(res);
+  const created = result.created?.['new-cal'];
+  if (!created) {
+    const err = result.notCreated?.['new-cal'];
+    throw new Error(err?.description || err?.type || 'Failed to create calendar');
+  }
+  return created;
+}
+
+// Destroy a calendar. `onDestroyEvents: 'destroy'` removes its events too —
+// Stalwart otherwise refuses to delete a non-empty calendar.
+export async function deleteCalendar(id: string): Promise<void> {
   const accountId = jmapClient.accountId;
   await jmapClient.request(
-    [['CalendarEvent/set', { accountId, destroy: ids }, '0']],
+    [['Calendar/set', { accountId, destroy: [id], onDestroyRemoveEvents: true }, '0']],
     USING,
   );
 }
diff --git a/src/api/contacts.ts b/src/api/contacts.ts
index f14d3467..0c5d95eb 100644
--- a/src/api/contacts.ts
+++ b/src/api/contacts.ts
@@ -91,3 +91,58 @@ export async function deleteContacts(ids: string[]): Promise<void> {
     USING,
   );
 }
+
+export async function createAddressBook(name: string): Promise<AddressBook> {
+  const accountId = jmapClient.accountId;
+  const res = await jmapClient.request(
+    [['AddressBook/set', { accountId, create: { 'new-book': { name } } }, '0']],
+    USING,
+  );
+  const result = methodResult<{
+    created?: Record<string, AddressBook>;
+    notCreated?: Record<string, { description?: string; type?: string }>;
+  }>(res);
+  const created = result.created?.['new-book'];
+  if (created) return { ...created, name };
+  const err = result.notCreated?.['new-book'];
+  throw new Error(err?.description || err?.type || 'Failed to create address book');
+}
+
+export async function updateAddressBook(
+  id: string,
+  updates: Partial<AddressBook>,
+): Promise<void> {
+  const accountId = jmapClient.accountId;
+  // Only forward server-settable properties.
+  const { name, description, sortOrder, isDefault } = updates as Record<string, unknown>;
+  const patch: Record<string, unknown> = {};
+  if (name !== undefined) patch.name = name;
+  if (description !== undefined) patch.description = description;
+  if (sortOrder !== undefined) patch.sortOrder = sortOrder;
+  if (isDefault !== undefined) patch.isDefault = isDefault;
+
+  const res = await jmapClient.request(
+    [['AddressBook/set', { accountId, update: { [id]: patch } }, '0']],
+    USING,
+  );
+  const result = methodResult<{ notUpdated?: Record<string, { description?: string; type?: string }> }>(res);
+  const err = result.notUpdated?.[id];
+  if (err) throw new Error(err.description || err.type || 'Failed to update address book');
+}
+
+export async function deleteAddressBook(id: string): Promise<void> {
+  const accountId = jmapClient.accountId;
+  const res = await jmapClient.request(
+    [['AddressBook/set', { accountId, destroy: [id] }, '0']],
+    USING,
+  );
+  const result = methodResult<{ notDestroyed?: Record<string, { description?: string; type?: string }> }>(res);
+  const err = result.notDestroyed?.[id];
+  if (err) throw new Error(err.description || err.type || 'Failed to delete address book');
+}
+
+/** Fetch all contact cards that live in a specific address book. */
+export async function getContactsInBook(addressBookId: string): Promise<ContactCard[]> {
+  const ids = await queryContacts({ inAddressBook: addressBookId });
+  return getContacts(ids);
+}
diff --git a/src/api/email.ts b/src/api/email.ts
index 2624748b..548aa89e 100644
--- a/src/api/email.ts
+++ b/src/api/email.ts
@@ -358,6 +358,50 @@ export async function moveEmail(
   ]);
 }
 
+// Move several emails from one mailbox to another in a single Email/set.
+export async function moveEmails(
+  ids: string[],
+  fromMailboxId: string,
+  toMailboxId: string,
+): Promise<void> {
+  if (ids.length === 0) return;
+  const accountId = jmapClient.accountId;
+  const update: Record<string, Record<string, unknown>> = {};
+  for (const id of ids) {
+    update[id] = {
+      [`mailboxIds/${fromMailboxId}`]: null,
+      [`mailboxIds/${toMailboxId}`]: true,
+    };
+  }
+  await jmapClient.request([['Email/set', { accountId, update }, '0']]);
+}
+
+// Batch delete: destroy outright when already in trash, otherwise move to trash.
+export async function deleteEmails(
+  ids: string[],
+  trashMailboxId: string,
+  currentMailboxId: string,
+): Promise<void> {
+  if (ids.length === 0) return;
+  if (currentMailboxId === trashMailboxId) {
+    const accountId = jmapClient.accountId;
+    await jmapClient.request([['Email/set', { accountId, destroy: ids }, '0']]);
+  } else {
+    await moveEmails(ids, currentMailboxId, trashMailboxId);
+  }
+}
+
+// Apply keyword maps to several emails in one round-trip.
+export async function setKeywordsForEmails(
+  updates: Array<{ id: string; keywords: Record<string, boolean> }>,
+): Promise<void> {
+  if (updates.length === 0) return;
+  const accountId = jmapClient.accountId;
+  const update: Record<string, { keywords: Record<string, boolean> }> = {};
+  for (const u of updates) update[u.id] = { keywords: u.keywords };
+  await jmapClient.request([['Email/set', { accountId, update }, '0']]);
+}
+
 // Restore each email's mailboxIds to the snapshot supplied. Used by undo to
 // reverse a move/archive/spam in one round-trip. JMAP "mailboxIds" replaces
 // the entire map, so we don't need to compute a diff against the current state.
@@ -558,6 +602,15 @@ export interface OutgoingAttachment {
   cid?: string;
 }
 
+export interface SendEmailResult {
+  /** True when the message was deferred (HOLDFOR / FUTURERELEASE). */
+  scheduled: boolean;
+  /** ISO timestamp the server resolved for a deferred send, when known. */
+  sendAt?: string;
+  emailId?: string;
+  emailSubmissionId?: string;
+}
+
 export async function sendEmail(
   email: {
     from: EmailAddress[];
@@ -573,7 +626,11 @@ export async function sendEmail(
   },
   identityId: string,
   sentMailboxId: string,
-): Promise<void> {
+  // When > 0 the message is held for this many seconds before delivery via the
+  // SMTP HOLDFOR parameter (FUTURERELEASE). Used for both explicit "send later"
+  // scheduling and the global send-delay (undo-send) window.
+  holdForSeconds?: number,
+): Promise<SendEmailResult> {
   const accountId = jmapClient.accountId;
   const emailCreate: Record<string, unknown> = {
     from: email.from,
@@ -615,14 +672,164 @@ export async function sendEmail(
     emailCreate['header:References:asText'] = email.references ?? email.inReplyTo;
   }
 
-  await jmapClient.request(
+  const submissionCreate: Record<string, unknown> = { emailId: '#draft', identityId };
+  // For a deferred send the envelope must be set explicitly so the HOLDFOR
+  // mail-from parameter rides along (JMAP §7.3: an omitted envelope makes the
+  // server derive mailFrom from the Identity, dropping our parameter).
+  if (holdForSeconds && holdForSeconds > 0) {
+    const rcptTo = [...email.to, ...(email.cc ?? []), ...(email.bcc ?? [])]
+      .map((r) => r.email.trim())
+      .filter(Boolean)
+      .map((address) => ({ email: address }));
+    submissionCreate.envelope = {
+      mailFrom: {
+        email: email.from[0]?.email,
+        parameters: { HOLDFOR: String(Math.ceil(holdForSeconds)) },
+      },
+      rcptTo,
+    };
+  }
+
+  const res = await jmapClient.request(
     [
       ['Email/set', { accountId, create: { draft: emailCreate } }, '0'],
       ['EmailSubmission/set', {
         accountId,
-        create: { 'sub-1': { emailId: '#draft', identityId } },
+        create: { 'sub-1': submissionCreate },
       }, '1'],
     ],
     [CAPABILITIES.CORE, CAPABILITIES.MAIL, CAPABILITIES.SUBMISSION],
   );
+
+  let emailId: string | undefined;
+  let emailSubmissionId: string | undefined;
+  let sendAt: string | undefined;
+  for (const [methodName, result] of res.methodResponses) {
+    if (methodName.endsWith('/error')) {
+      throw new Error((result as { description?: string }).description ?? 'Send failed');
+    }
+    if (methodName === 'Email/set') {
+      const notCreated = (result as { notCreated?: Record<string, { description?: string; type?: string }> }).notCreated?.draft;
+      if (notCreated) throw new Error(notCreated.description ?? notCreated.type ?? 'Failed to create message');
+      emailId = (result as { created?: Record<string, { id?: string }> }).created?.draft?.id;
+    }
+    if (methodName === 'EmailSubmission/set') {
+      const notCreated = (result as { notCreated?: Record<string, { description?: string; type?: string }> }).notCreated?.['sub-1'];
+      if (notCreated) throw new Error(notCreated.description ?? notCreated.type ?? 'Failed to submit message');
+      const created = (result as { created?: Record<string, { id?: string; sendAt?: string }> }).created?.['sub-1'];
+      emailSubmissionId = created?.id;
+      sendAt = created?.sendAt;
+    }
+  }
+
+  return {
+    scheduled: !!(holdForSeconds && holdForSeconds > 0),
+    sendAt,
+    emailId,
+    emailSubmissionId,
+  };
+}
+
+export interface ScheduledEmail {
+  emailSubmissionId: string;
+  emailId: string;
+  identityId: string;
+  threadId?: string;
+  sendAt: string;
+  undoStatus?: string;
+  subject?: string;
+  to?: EmailAddress[];
+  from?: EmailAddress[];
+  preview?: string;
+}
+
+// List pending (not-yet-delivered, not cancelled) scheduled submissions whose
+// send time is still in the future, joined with a light Email/get so the UI
+// can show subject/recipients. Empty when the server lacks FUTURERELEASE.
+export async function listScheduledEmails(): Promise<ScheduledEmail[]> {
+  if (!jmapClient.hasDelayedSend()) return [];
+  const accountId = jmapClient.accountId;
+  const now = Date.now();
+
+  const queryRes = await jmapClient.request(
+    [['EmailSubmission/query', { accountId, limit: 200 }, '0']],
+    [CAPABILITIES.CORE, CAPABILITIES.SUBMISSION],
+  );
+  const [queryName, queryBody] = queryRes.methodResponses[0];
+  if (queryName.endsWith('/error')) return [];
+  const ids = (queryBody.ids as string[]) ?? [];
+  if (ids.length === 0) return [];
+
+  const subRes = await jmapClient.request(
+    [['EmailSubmission/get', {
+      accountId,
+      ids,
+      properties: ['id', 'emailId', 'identityId', 'threadId', 'sendAt', 'undoStatus'],
+    }, '0']],
+    [CAPABILITIES.CORE, CAPABILITIES.SUBMISSION],
+  );
+  const submissions = ((subRes.methodResponses[0][1].list as Array<{
+    id: string;
+    emailId: string;
+    identityId: string;
+    threadId?: string;
+    sendAt?: string;
+    undoStatus?: string;
+  }>) ?? []).filter((s) => {
+    if (s.undoStatus !== 'pending' || !s.sendAt) return false;
+    const t = new Date(s.sendAt).getTime();
+    return Number.isFinite(t) && t > now;
+  });
+  if (submissions.length === 0) return [];
+
+  const emailIds = Array.from(new Set(submissions.map((s) => s.emailId)));
+  const emailRes = await jmapClient.request([
+    ['Email/get', {
+      accountId,
+      ids: emailIds,
+      properties: ['id', 'subject', 'to', 'from', 'preview', 'threadId'],
+    }, '0'],
+  ]);
+  const emailById = new Map(
+    ((emailRes.methodResponses[0][1].list as Email[]) ?? []).map((e) => [e.id, e]),
+  );
+
+  return submissions
+    .map((s): ScheduledEmail | null => {
+      const e = emailById.get(s.emailId);
+      if (!s.sendAt) return null;
+      return {
+        emailSubmissionId: s.id,
+        emailId: s.emailId,
+        identityId: s.identityId,
+        threadId: s.threadId ?? e?.threadId,
+        sendAt: s.sendAt,
+        undoStatus: s.undoStatus,
+        subject: e?.subject,
+        to: e?.to,
+        from: e?.from,
+        preview: e?.preview,
+      };
+    })
+    .filter((s): s is ScheduledEmail => s !== null)
+    .sort((a, b) => new Date(a.sendAt).getTime() - new Date(b.sendAt).getTime());
+}
+
+// Cancel a pending scheduled send. The held message copy stays in Sent; only
+// delivery is stopped (matches the webmail behaviour).
+export async function cancelScheduledSend(emailSubmissionId: string): Promise<void> {
+  const accountId = jmapClient.accountId;
+  const res = await jmapClient.request(
+    [['EmailSubmission/set', {
+      accountId,
+      update: { [emailSubmissionId]: { undoStatus: 'canceled' } },
+    }, '0']],
+    [CAPABILITIES.CORE, CAPABILITIES.SUBMISSION],
+  );
+  const failure = res.methodResponses[0][1].notUpdated?.[emailSubmissionId] as
+    | { type?: string; description?: string }
+    | undefined;
+  if (failure) {
+    throw new Error(failure.description ?? failure.type ?? 'Failed to cancel scheduled send');
+  }
 }
diff --git a/src/api/jmap-client.ts b/src/api/jmap-client.ts
index 6c7e8d3f..67d7de8b 100644
--- a/src/api/jmap-client.ts
+++ b/src/api/jmap-client.ts
@@ -451,6 +451,59 @@ export class JMAPClient {
     return core?.maxObjectsInGet || 500;
   }
 
+  // ── Scheduled send (FUTURERELEASE) ────────────────────
+  // The JMAP submission capability advertises `maxDelayedSend` (max hold in
+  // seconds) and a `submissionExtensions` map; FUTURERELEASE support is what
+  // lets us defer delivery via the SMTP HOLDFOR parameter. Mirrors the webmail
+  // implementation so behaviour stays in sync across platforms.
+
+  private get submissionCapability():
+    | { maxDelayedSend?: number; submissionExtensions?: unknown }
+    | undefined {
+    return this.session?.capabilities?.[CAPABILITIES.SUBMISSION] as
+      | { maxDelayedSend?: number; submissionExtensions?: unknown }
+      | undefined;
+  }
+
+  getMaxDelayedSend(): number {
+    const max = this.submissionCapability?.maxDelayedSend;
+    return typeof max === 'number' ? max : 0;
+  }
+
+  hasDelayedSend(): boolean {
+    const cap = this.submissionCapability;
+    if (!cap) return false;
+    const ext = cap.submissionExtensions;
+    // submissionExtensions is a map of extension name → params. FUTURERELEASE
+    // (RFC 4865) is the SMTP extension that backs deferred delivery.
+    const hasFutureRelease =
+      !!ext &&
+      typeof ext === 'object' &&
+      Object.keys(ext as Record<string, unknown>).some(
+        (k) => k.toUpperCase() === 'FUTURERELEASE',
+      );
+    return hasFutureRelease && this.getMaxDelayedSend() > 0;
+  }
+
+  // ── Stored credentials (per-account) ──────────────────
+  // Exposed so the unified-inbox aggregator can read another account's
+  // credentials without disturbing this client's live session, and persist a
+  // refreshed OAuth token back to secure storage.
+
+  async getStoredCredentials(accountId: string): Promise<StoredCredentials | null> {
+    const stored = await SecureStore.getItemAsync(credentialsKey(accountId));
+    if (!stored) return null;
+    try {
+      return JSON.parse(stored) as StoredCredentials;
+    } catch {
+      return null;
+    }
+  }
+
+  async setStoredCredentials(accountId: string, creds: StoredCredentials): Promise<void> {
+    await SecureStore.setItemAsync(credentialsKey(accountId), JSON.stringify(creds));
+  }
+
   // ── Blob Download ─────────────────────────────────────
 
   // Expand the RFC 6570 level-1 template the JMAP server advertises.
diff --git a/src/api/types.ts b/src/api/types.ts
index b1b085e1..0845c261 100644
--- a/src/api/types.ts
+++ b/src/api/types.ts
@@ -288,6 +288,13 @@ export interface ContactCryptoKey {
   contexts?: Record<string, boolean>;
 }
 
+export interface ContactDirectory {
+  uri: string;
+  kind?: 'directory' | 'entry' | string;
+  mediaType?: string;
+  pref?: number;
+}
+
 export interface ContactPronouns {
   pronouns: string;
   pref?: number;
@@ -322,12 +329,15 @@ export interface ContactCard {
   relatedTo?: Record<string, ContactRelation>;
   links?: Record<string, ContactLink>;
   cryptoKeys?: Record<string, ContactCryptoKey>;
+  directories?: Record<string, ContactDirectory>;
   keywords?: Record<string, boolean>;
   members?: Record<string, boolean>;
   speakToAs?: ContactSpeakToAs;
   calendarUri?: string;
   schedulingUri?: string;
   freeBusyUri?: string;
+  source?: string;
+  prodId?: string;
   created?: string;
   updated?: string;
 }
@@ -356,13 +366,39 @@ export interface AddressBookWithCount extends AddressBook {
 // ─── Calendar (RFC 8984 JSCalendar) ─────────────────────
 
 export interface Participant {
+  '@type'?: 'Participant';
   name?: string;
   email?: string;
   sendTo?: Record<string, string>;
+  // Stalwart uses calendarAddress (a `mailto:` URI) instead of email/sendTo.
+  calendarAddress?: string;
   kind?: string;
   roles?: Record<string, boolean>;
-  participationStatus?: string;
+  participationStatus?: 'needs-action' | 'accepted' | 'declined' | 'tentative' | 'delegated' | string;
+  participationComment?: string;
+  scheduleStatus?: string[];
   expectReply?: boolean;
+  description?: string;
+}
+
+// JSCalendar Location (RFC 8984 §4.2.5) — a physical place.
+export interface EventLocation {
+  '@type'?: 'Location';
+  name?: string;
+  description?: string;
+  locationTypes?: Record<string, boolean>;
+  relativeTo?: string;
+  timeZone?: string;
+  coordinates?: string;
+}
+
+// JSCalendar VirtualLocation (RFC 8984 §4.2.6) — a video/online place.
+export interface VirtualLocation {
+  '@type'?: 'VirtualLocation';
+  name?: string;
+  description?: string;
+  uri: string;
+  features?: Record<string, boolean>;
 }
 
 export interface RecurrenceRule {
@@ -403,27 +439,56 @@ export interface CalendarEvent {
   status?: string;
   freeBusyStatus?: string;
   participants?: Record<string, Participant>;
+  // Scheduling (iTIP/iMIP). `replyTo` tells the server where RSVP replies go;
+  // Stalwart additionally exposes the organizer as `organizerCalendarAddress`.
+  replyTo?: Record<string, string>;
+  organizerCalendarAddress?: string;
+  sequence?: number;
   recurrenceRules?: RecurrenceRule[];
   recurrenceOverrides?: Record<string, Partial<CalendarEvent>>;
   excludedRecurrenceRules?: RecurrenceRule[];
   recurrenceId?: string;
   originalId?: string;
+  useDefaultAlerts?: boolean;
   alerts?: Record<string, Alert>;
+  locations?: Record<string, EventLocation>;
+  virtualLocations?: Record<string, VirtualLocation>;
   links?: Record<string, { href: string; rel?: string }>;
   created?: string;
   updated?: string;
-  progress?: string;
+  // Task-only (RFC 8984 JSTask) fields.
+  progress?: 'needs-action' | 'in-process' | 'completed' | 'failed' | 'cancelled' | string;
   due?: string;
+  priority?: number;
+  percentComplete?: number;
   color?: string;
+  // Client-only: account the event/occurrence belongs to (for shared/virtual).
+  localAccountId?: string;
+}
+
+export interface CalendarRights {
+  mayReadFreeBusy?: boolean;
+  mayReadItems?: boolean;
+  mayWriteAll?: boolean;
+  mayWriteOwn?: boolean;
+  mayUpdatePrivate?: boolean;
+  mayRSVP?: boolean;
+  mayShare?: boolean;
+  mayDelete?: boolean;
+  // Legacy short flag still read by the sidebar drawer.
+  mayWrite?: boolean;
 }
 
 export interface Calendar {
   id: string;
   name: string;
+  description?: string | null;
   color?: string;
   isVisible?: boolean;
+  isSubscribed?: boolean;
+  isDefault?: boolean;
   sortOrder?: number;
-  myRights?: Record<string, boolean>;
+  myRights?: CalendarRights;
 }
 
 // ─── Files (FileNode) ───────────────────────────────────
diff --git a/src/api/unified-inbox.ts b/src/api/unified-inbox.ts
new file mode 100644
index 00000000..1da5b398
--- /dev/null
+++ b/src/api/unified-inbox.ts
@@ -0,0 +1,196 @@
+import { CAPABILITIES } from './types';
+import type { Email, JMAPSession, JMAPMethodCall, Mailbox } from './types';
+import { jmapClient, type StoredCredentials } from './jmap-client';
+import { secureFetch } from '../lib/client-cert';
+import { refreshOAuthAccessToken, type OAuthTokens } from '../lib/oauth';
+
+// Aggregated inbox across every logged-in account. Because the JMAP client is
+// a single-account singleton (one live session at a time), we fetch each
+// account's inbox "detached" here — reading its stored credentials directly and
+// issuing requests against its own API URL — so the active account's live
+// session is never disturbed.
+
+const EMAIL_LIST_PROPERTIES = [
+  'id', 'threadId', 'mailboxIds', 'keywords', 'size',
+  'receivedAt', 'from', 'to', 'subject', 'preview', 'hasAttachment',
+];
+
+const TOKEN_REFRESH_LEEWAY_MS = 60_000;
+
+export interface UnifiedEmail extends Email {
+  /** Registry account id this message belongs to (not the JMAP account id). */
+  sourceAccountId: string;
+}
+
+export interface UnifiedInboxResult {
+  emails: UnifiedEmail[];
+  /** accountId → error message for accounts that could not be fetched. */
+  errors: Record<string, string>;
+}
+
+function authHeaderFor(creds: StoredCredentials): string {
+  if (creds.accessToken) return `Bearer ${creds.accessToken}`;
+  return `Basic ${btoa(`${creds.username}:${creds.password}`)}`;
+}
+
+function originOf(url: string): string | null {
+  const m = url.match(/^(https?:\/\/[^/?#]+)/i);
+  return m ? m[1] : null;
+}
+
+// Same intent as JMAPClient.rewriteSessionUrls: point the advertised apiUrl at
+// the origin we actually connected to (servers often self-report unreachable
+// container-internal hosts).
+function rewriteApiUrl(session: JMAPSession, serverUrl: string): string {
+  const serverOrigin = originOf(serverUrl);
+  const apiOrigin = originOf(session.apiUrl);
+  if (!apiOrigin || !serverOrigin || apiOrigin === serverOrigin) return session.apiUrl;
+  return serverOrigin + session.apiUrl.slice(apiOrigin.length);
+}
+
+function resolveJmapAccountId(session: JMAPSession): string | null {
+  return (
+    session.primaryAccounts?.[CAPABILITIES.MAIL] ||
+    session.primaryAccounts?.[CAPABILITIES.CORE] ||
+    Object.keys(session.accounts ?? {})[0] ||
+    null
+  );
+}
+
+// Refresh an about-to-expire OAuth token and persist it so the next fetch (and
+// a later account switch) reuse the fresh one. Returns possibly-updated creds.
+async function ensureFreshCredentials(
+  accountId: string,
+  creds: StoredCredentials,
+): Promise<StoredCredentials> {
+  if (
+    !creds.accessToken ||
+    !creds.refreshToken ||
+    !creds.tokenEndpoint ||
+    !creds.clientId ||
+    creds.expiresAt == null
+  ) {
+    return creds;
+  }
+  if (creds.expiresAt - Date.now() > TOKEN_REFRESH_LEEWAY_MS) return creds;
+  try {
+    const tokens: OAuthTokens = {
+      accessToken: creds.accessToken,
+      refreshToken: creds.refreshToken,
+      expiresAt: creds.expiresAt,
+      tokenEndpoint: creds.tokenEndpoint,
+      clientId: creds.clientId,
+    };
+    const next = await refreshOAuthAccessToken(tokens);
+    const updated: StoredCredentials = {
+      ...creds,
+      accessToken: next.accessToken,
+      refreshToken: next.refreshToken ?? creds.refreshToken,
+      expiresAt: next.expiresAt,
+      tokenEndpoint: next.tokenEndpoint,
+      clientId: next.clientId,
+    };
+    await jmapClient.setStoredCredentials(accountId, updated);
+    return updated;
+  } catch {
+    // Fall back to the existing (possibly expired) token; the request will
+    // surface a 401 which we report as an error for this account.
+    return creds;
+  }
+}
+
+async function jmapPost(
+  apiUrl: string,
+  authHeader: string,
+  methodCalls: JMAPMethodCall[],
+  using: string[],
+): Promise<Array<[string, Record<string, any>, string]>> {
+  const response = await secureFetch(apiUrl, {
+    method: 'POST',
+    headers: { 'Content-Type': 'application/json', Authorization: authHeader },
+    body: JSON.stringify({ using, methodCalls }),
+  });
+  if (response.status === 401) throw new Error('Session expired');
+  if (!response.ok) throw new Error(`JMAP request failed: ${response.status}`);
+  const body = await response.json();
+  return body.methodResponses ?? [];
+}
+
+async function fetchInboxForAccount(
+  accountId: string,
+  limit: number,
+): Promise<UnifiedEmail[]> {
+  let creds = await jmapClient.getStoredCredentials(accountId);
+  if (!creds) throw new Error('No stored credentials');
+  creds = await ensureFreshCredentials(accountId, creds);
+
+  const baseUrl = creds.serverUrl.replace(/\/+$/, '');
+  const authHeader = authHeaderFor(creds);
+
+  // Session discovery.
+  const sessionRes = await secureFetch(`${baseUrl}/.well-known/jmap`, {
+    headers: { Authorization: authHeader, Accept: 'application/json' },
+  });
+  if (sessionRes.status === 401) throw new Error('Session expired');
+  if (!sessionRes.ok) throw new Error(`Session discovery failed: ${sessionRes.status}`);
+  const session = (await sessionRes.json()) as JMAPSession;
+  const apiUrl = rewriteApiUrl(session, baseUrl);
+  const jmapAccountId = resolveJmapAccountId(session);
+  if (!jmapAccountId) throw new Error('No mail account in session');
+
+  // Find the inbox mailbox.
+  const mailboxResponses = await jmapPost(
+    apiUrl,
+    authHeader,
+    [['Mailbox/get', { accountId: jmapAccountId, properties: ['id', 'role', 'name'] }, '0']],
+    [CAPABILITIES.CORE, CAPABILITIES.MAIL],
+  );
+  const mailboxes = (mailboxResponses[0]?.[1]?.list as Mailbox[]) ?? [];
+  const inbox = mailboxes.find((m) => m.role === 'inbox') ?? mailboxes[0];
+  if (!inbox) return [];
+
+  // Query + fetch the most recent messages.
+  const queryResponses = await jmapPost(
+    apiUrl,
+    authHeader,
+    [['Email/query', {
+      accountId: jmapAccountId,
+      filter: { inMailbox: inbox.id },
+      sort: [{ property: 'receivedAt', isAscending: false }],
+      limit,
+    }, '0']],
+    [CAPABILITIES.CORE, CAPABILITIES.MAIL],
+  );
+  const ids = (queryResponses[0]?.[1]?.ids as string[]) ?? [];
+  if (ids.length === 0) return [];
+
+  const getResponses = await jmapPost(
+    apiUrl,
+    authHeader,
+    [['Email/get', { accountId: jmapAccountId, ids, properties: EMAIL_LIST_PROPERTIES }, '0']],
+    [CAPABILITIES.CORE, CAPABILITIES.MAIL],
+  );
+  const list = (getResponses[0]?.[1]?.list as Email[]) ?? [];
+  return list.map((e) => ({ ...e, sourceAccountId: accountId }));
+}
+
+export async function fetchUnifiedInbox(
+  accountIds: string[],
+  perAccountLimit = 25,
+): Promise<UnifiedInboxResult> {
+  const errors: Record<string, string> = {};
+  const settled = await Promise.all(
+    accountIds.map(async (id) => {
+      try {
+        return await fetchInboxForAccount(id, perAccountLimit);
+      } catch (err) {
+        errors[id] = err instanceof Error ? err.message : 'Failed to load';
+        return [] as UnifiedEmail[];
+      }
+    }),
+  );
+  const emails = settled
+    .flat()
+    .sort((a, b) => new Date(b.receivedAt).getTime() - new Date(a.receivedAt).getTime());
+  return { emails, errors };
+}
diff --git a/src/components/EmailBodyView.tsx b/src/components/EmailBodyView.tsx
index 3d0006ae..72a3646d 100644
--- a/src/components/EmailBodyView.tsx
+++ b/src/components/EmailBodyView.tsx
@@ -140,7 +140,18 @@ export default function EmailBodyView({ email, senderEmail }: EmailBodyViewProps
   const emailAlwaysLightMode = useSettingsStore((s) => s.emailAlwaysLightMode);
   const hideInlineImageAttachments = useSettingsStore((s) => s.hideInlineImageAttachments);
   const contacts = useContactsStore((s) => s.contacts);
+  const trustedSenderEmails = useContactsStore((s) => s.trustedSenderEmails);
+  const trustedSendersLoaded = useContactsStore((s) => s.trustedSendersLoaded);
+  const loadTrustedSendersBook = useContactsStore((s) => s.loadTrustedSendersBook);
+  const addToTrustedSendersBook = useContactsStore((s) => s.addToTrustedSendersBook);
   const resolvedTheme = useResolvedTheme();
+
+  // Passively load the dedicated "Trusted Senders" address book once so its
+  // entries (synced across devices) feed the external-content trust check. We
+  // do not create the book here — it is created lazily when a sender is trusted.
+  React.useEffect(() => {
+    if (!trustedSendersLoaded) void loadTrustedSendersBook(false);
+  }, [trustedSendersLoaded, loadTrustedSendersBook]);
   // Index the address book once per render so the trusted-sender check below
   // is O(1) per email. Only used when the matching setting is on.
   const addressBookEmails = React.useMemo(() => {
@@ -170,6 +181,7 @@ export default function EmailBodyView({ email, senderEmail }: EmailBodyViewProps
   const hasRemote = rawHtml ? hasRemoteContent(rawHtml) : false;
   const trusted = senderEmail
     ? isSenderTrusted(senderEmail)
+      || trustedSenderEmails.includes(senderEmail.toLowerCase())
       || (addressBookEmails?.has(senderEmail.toLowerCase()) ?? false)
     : false;
 
@@ -270,7 +282,11 @@ export default function EmailBodyView({ email, senderEmail }: EmailBodyViewProps
   const onLoadImages = () => setAllowOnce(true);
   const onTrustSender = () => {
     if (senderEmail) {
+      // Keep the local allow-list for instant effect, and persist to the
+      // dedicated "Trusted Senders" address book so the trust syncs across
+      // devices (matches the webmail behavior).
       addTrustedSender(senderEmail);
+      void addToTrustedSendersBook(senderEmail).catch(() => {});
       setAllowOnce(true);
     }
   };
diff --git a/src/components/SidebarDrawer.tsx b/src/components/SidebarDrawer.tsx
index 5daded3d..0daf26e7 100644
--- a/src/components/SidebarDrawer.tsx
+++ b/src/components/SidebarDrawer.tsx
@@ -8,6 +8,7 @@ import { SafeAreaView } from 'react-native-safe-area-context';
 import {
   Inbox, Send, File as FileIcon, Trash2, Ban, Archive, Star,
   Folder, FolderOpen, ChevronDown, ChevronRight, X, Settings, LogOut, Check, Plus,
+  Clock, Layers,
 } from 'lucide-react-native';
 import type { LucideIcon } from 'lucide-react-native';
 import { spacing, radius, typography, type ThemePalette } from '../theme/tokens';
@@ -427,6 +428,24 @@ export default function SidebarDrawer({ visible, onClose }: SidebarDrawerProps)
           )}
 
           <ScrollView style={styles.scroll} contentContainerStyle={styles.scrollContent}>
+            {/* Quick views */}
+            {accounts.length > 1 && (
+              <Pressable
+                style={({ pressed }) => [styles.quickRow, pressed && styles.rowPressed]}
+                onPress={() => { onClose(); navigation.navigate('UnifiedInbox'); }}
+              >
+                <Layers size={16} color={c.textSecondary} />
+                <Text style={styles.quickRowLabel}>All inboxes</Text>
+              </Pressable>
+            )}
+            <Pressable
+              style={({ pressed }) => [styles.quickRow, pressed && styles.rowPressed]}
+              onPress={() => { onClose(); navigation.navigate('Scheduled'); }}
+            >
+              <Clock size={16} color={c.textSecondary} />
+              <Text style={styles.quickRowLabel}>Scheduled</Text>
+            </Pressable>
+
             {/* Folders section */}
             <Pressable style={styles.sectionHeader} onPress={toggleFoldersSection}>
               {foldersExpanded ? (
@@ -667,6 +686,17 @@ function makeStyles(c: ThemePalette) {
   },
   sectionSettings: { padding: 4 },
 
+  quickRow: {
+    flexDirection: 'row',
+    alignItems: 'center',
+    gap: spacing.sm,
+    minHeight: 44,
+    paddingHorizontal: spacing.md,
+    borderLeftWidth: 2,
+    borderLeftColor: 'transparent',
+  },
+  quickRowLabel: { ...typography.body, color: c.text },
+
   empty: {
     ...typography.body,
     color: c.textMuted,
diff --git a/src/components/TagSheet.tsx b/src/components/TagSheet.tsx
new file mode 100644
index 00000000..079c9caf
--- /dev/null
+++ b/src/components/TagSheet.tsx
@@ -0,0 +1,142 @@
+import React from 'react';
+import {
+  View, Text, StyleSheet, ScrollView, Pressable, Modal, Animated, Easing,
+} from 'react-native';
+import { useSafeAreaInsets } from 'react-native-safe-area-context';
+import { X, Check, Tag } from 'lucide-react-native';
+import { spacing, radius, typography, colors as tokenColors, type ThemePalette } from '../theme/tokens';
+import { useColors } from '../theme/colors';
+import { useSheetDrag } from '../lib/use-sheet-drag';
+import { keywordToken, type KeywordDef } from '../stores/keywords-store';
+import type { Email } from '../api/types';
+
+interface TagSheetProps {
+  visible: boolean;
+  onClose: () => void;
+  keywords: KeywordDef[];
+  /** The currently-selected emails, used to show which tags are already set. */
+  selectedEmails: Email[];
+  /** Toggle a keyword token on/off across the whole selection. */
+  onToggle: (token: string, on: boolean) => void;
+}
+
+export function TagSheet({ visible, onClose, keywords, selectedEmails, onToggle }: TagSheetProps) {
+  const c = useColors();
+  const styles = React.useMemo(() => makeStyles(c), [c]);
+  const insets = useSafeAreaInsets();
+  const slideY = React.useRef(new Animated.Value(500)).current;
+  const overlayOpacity = React.useRef(new Animated.Value(0)).current;
+  const dragHandlers = useSheetDrag({ slideY, closedY: 500, onClose });
+
+  React.useEffect(() => {
+    if (visible) {
+      Animated.parallel([
+        Animated.timing(slideY, { toValue: 0, duration: 220, easing: Easing.out(Easing.cubic), useNativeDriver: true }),
+        Animated.timing(overlayOpacity, { toValue: 1, duration: 220, useNativeDriver: true }),
+      ]).start();
+    } else {
+      Animated.parallel([
+        Animated.timing(slideY, { toValue: 500, duration: 180, easing: Easing.in(Easing.cubic), useNativeDriver: true }),
+        Animated.timing(overlayOpacity, { toValue: 0, duration: 180, useNativeDriver: true }),
+      ]).start();
+    }
+  }, [visible, slideY, overlayOpacity]);
+
+  // A tag counts as "applied" only when every selected email carries it; in
+  // that case tapping removes it, otherwise tapping adds it to all.
+  const allHaveToken = React.useCallback(
+    (token: string) =>
+      selectedEmails.length > 0 && selectedEmails.every((e) => !!e.keywords?.[token]),
+    [selectedEmails],
+  );
+
+  return (
+    <Modal visible={visible} transparent animationType="none" onRequestClose={onClose} statusBarTranslucent>
+      <Animated.View style={[styles.overlay, { opacity: overlayOpacity }]}>
+        <Pressable style={styles.overlayPress} onPress={onClose} />
+      </Animated.View>
+      <Animated.View
+        style={[
+          styles.sheet,
+          { paddingBottom: Math.max(insets.bottom, spacing.md), transform: [{ translateY: slideY }] },
+        ]}
+      >
+        <View {...dragHandlers}>
+          <View style={styles.handleHit}>
+            <View style={styles.handle} />
+          </View>
+          <View style={styles.header}>
+            <Text style={styles.title}>Tag {selectedEmails.length} selected</Text>
+            <Pressable onPress={onClose} hitSlop={8} style={styles.close}>
+              <X size={18} color={c.textSecondary} />
+            </Pressable>
+          </View>
+        </View>
+        <ScrollView>
+          {keywords.length === 0 ? (
+            <Text style={styles.empty}>No tags defined. Add tags in Settings.</Text>
+          ) : (
+            keywords.map((kw) => {
+              const token = keywordToken(kw.id);
+              const applied = allHaveToken(token);
+              const dot = tokenColors.tags[kw.color]?.dot ?? c.primary;
+              return (
+                <Pressable
+                  key={kw.id}
+                  onPress={() => onToggle(token, !applied)}
+                  style={({ pressed }) => [styles.row, pressed && styles.rowPressed]}
+                >
+                  <Tag size={16} color={dot} fill={dot} />
+                  <Text style={styles.rowLabel} numberOfLines={1}>{kw.label}</Text>
+                  {applied && <Check size={16} color={c.primary} />}
+                </Pressable>
+              );
+            })
+          )}
+        </ScrollView>
+      </Animated.View>
+    </Modal>
+  );
+}
+
+function makeStyles(c: ThemePalette) {
+  return StyleSheet.create({
+    overlay: { ...StyleSheet.absoluteFillObject, backgroundColor: 'rgba(0,0,0,0.5)' },
+    overlayPress: { flex: 1 },
+    sheet: {
+      position: 'absolute',
+      left: 0, right: 0, bottom: 0,
+      maxHeight: '75%',
+      backgroundColor: c.popover,
+      borderTopLeftRadius: radius.lg,
+      borderTopRightRadius: radius.lg,
+      borderTopWidth: 1,
+      borderColor: c.border,
+      paddingTop: spacing.sm,
+    },
+    handleHit: { alignItems: 'center', paddingTop: spacing.xs, paddingBottom: spacing.sm },
+    handle: { width: 36, height: 4, borderRadius: 2, backgroundColor: c.border },
+    header: {
+      flexDirection: 'row',
+      alignItems: 'center',
+      justifyContent: 'space-between',
+      paddingHorizontal: spacing.lg,
+      paddingBottom: spacing.sm,
+      borderBottomWidth: 1,
+      borderBottomColor: c.border,
+    },
+    title: { ...typography.bodySemibold, color: c.text },
+    close: { width: 28, height: 28, alignItems: 'center', justifyContent: 'center', borderRadius: radius.xs },
+    empty: { ...typography.body, color: c.textMuted, padding: spacing.lg, textAlign: 'center' },
+    row: {
+      flexDirection: 'row',
+      alignItems: 'center',
+      gap: spacing.sm,
+      paddingHorizontal: spacing.lg,
+      paddingVertical: spacing.sm + 2,
+      minHeight: 44,
+    },
+    rowPressed: { backgroundColor: c.surfaceHover },
+    rowLabel: { ...typography.body, color: c.text, flex: 1 },
+  });
+}
diff --git a/src/components/calendar/CalendarSidebarDrawer.tsx b/src/components/calendar/CalendarSidebarDrawer.tsx
index bb552899..72ed0ca3 100644
--- a/src/components/calendar/CalendarSidebarDrawer.tsx
+++ b/src/components/calendar/CalendarSidebarDrawer.tsx
@@ -11,7 +11,7 @@ import {
   View,
 } from 'react-native';
 import { SafeAreaView } from 'react-native-safe-area-context';
-import { Check, X } from 'lucide-react-native';
+import { Check, X, Upload, Rss } from 'lucide-react-native';
 import type { Calendar } from '../../api/types';
 import { radius, spacing, typography, type ThemePalette } from '../../theme/tokens';
 import { useColors } from '../../theme/colors';
@@ -24,6 +24,8 @@ interface CalendarSidebarDrawerProps {
   hiddenCalendarIds: string[];
   onToggle: (id: string) => void;
   onClose: () => void;
+  onImport?: () => void;
+  onManageSubscriptions?: () => void;
 }
 
 export function CalendarSidebarDrawer({
@@ -32,6 +34,8 @@ export function CalendarSidebarDrawer({
   hiddenCalendarIds,
   onToggle,
   onClose,
+  onImport,
+  onManageSubscriptions,
 }: CalendarSidebarDrawerProps) {
   const c = useColors();
   const styles = React.useMemo(() => makeStyles(c), [c]);
@@ -122,6 +126,29 @@ export function CalendarSidebarDrawer({
                 onToggle={onToggle}
               />
             )}
+
+            {(onImport || onManageSubscriptions) && (
+              <View style={styles.actionsSection}>
+                {onManageSubscriptions && (
+                  <Pressable
+                    onPress={onManageSubscriptions}
+                    style={({ pressed }) => [styles.actionRow, pressed && styles.rowPressed]}
+                  >
+                    <Rss size={18} color={c.textSecondary} />
+                    <Text style={styles.actionText}>Subscriptions</Text>
+                  </Pressable>
+                )}
+                {onImport && (
+                  <Pressable
+                    onPress={onImport}
+                    style={({ pressed }) => [styles.actionRow, pressed && styles.rowPressed]}
+                  >
+                    <Upload size={18} color={c.textSecondary} />
+                    <Text style={styles.actionText}>Import from file</Text>
+                  </Pressable>
+                )}
+              </View>
+            )}
           </ScrollView>
         </SafeAreaView>
       </Animated.View>
@@ -251,5 +278,21 @@ function makeStyles(c: ThemePalette) {
   },
   rowName: { flex: 1, ...typography.body, color: c.text },
   rowNameMuted: { color: c.textMuted },
+
+  actionsSection: {
+    marginTop: spacing.lg,
+    paddingTop: spacing.sm,
+    borderTopWidth: 1,
+    borderTopColor: c.border,
+  },
+  actionRow: {
+    flexDirection: 'row',
+    alignItems: 'center',
+    gap: spacing.md,
+    paddingHorizontal: spacing.lg,
+    paddingVertical: spacing.sm,
+    minHeight: 44,
+  },
+  actionText: { ...typography.body, color: c.text },
   });
 }
diff --git a/src/components/calendar/EventDetailSheet.tsx b/src/components/calendar/EventDetailSheet.tsx
index f0a92cf2..ee2c2503 100644
--- a/src/components/calendar/EventDetailSheet.tsx
+++ b/src/components/calendar/EventDetailSheet.tsx
@@ -3,6 +3,7 @@ import {
   Animated,
   Dimensions,
   Easing,
+  Linking,
   Modal,
   Pressable,
   ScrollView,
@@ -15,13 +16,16 @@ import {
   AlignLeft,
   Bell,
   Calendar as CalendarIcon,
+  Check,
   Clock,
   Copy,
+  HelpCircle,
   MapPin,
   Pencil,
   Repeat,
   Trash2,
   Users,
+  Video,
   X,
 } from 'lucide-react-native';
 import { format } from 'date-fns';
@@ -33,8 +37,16 @@ import {
   getEventColor,
   getPrimaryCalendarId,
 } from '../../lib/calendar-utils';
+import { alertsToReminders, formatReminder } from '../../lib/calendar-alerts';
+import {
+  findParticipantByEmail,
+  isOrganizerParticipant,
+} from '../../lib/calendar-invitation';
+import { useAccountStore } from '../../stores/account-store';
 import { useSheetDrag } from '../../lib/use-sheet-drag';
 
+type RsvpStatus = 'accepted' | 'declined' | 'tentative';
+
 interface EventDetailSheetProps {
   event: CalendarEvent | null;
   calendars: Calendar[];
@@ -42,6 +54,7 @@ interface EventDetailSheetProps {
   onEdit?: (event: CalendarEvent) => void;
   onDelete?: (event: CalendarEvent) => void;
   onDuplicate?: (event: CalendarEvent) => void;
+  onRsvp?: (event: CalendarEvent, participantId: string, status: RsvpStatus) => void | Promise<void>;
 }
 
 function formatRange(event: CalendarEvent): string {
@@ -84,22 +97,6 @@ function recurrenceLabel(event: CalendarEvent): string | null {
   return label;
 }
 
-function alertLabel(event: CalendarEvent): string | null {
-  if (!event.alerts) return null;
-  const first = Object.values(event.alerts)[0];
-  if (!first) return null;
-  const offset = first.trigger?.offset;
-  if (!offset) return null;
-  if (offset === 'PT0S' || offset === '-PT0S') return 'At time of event';
-  const min = offset.match(/-?PT(\d+)M$/);
-  if (min) return `${min[1]} minutes before`;
-  const hr = offset.match(/-?PT(\d+)H$/);
-  if (hr) return `${hr[1]} hours before`;
-  const day = offset.match(/-?P(\d+)D/);
-  if (day) return `${day[1]} days before`;
-  return null;
-}
-
 export function EventDetailSheet({
   event,
   calendars,
@@ -107,8 +104,11 @@ export function EventDetailSheet({
   onEdit,
   onDelete,
   onDuplicate,
+  onRsvp,
 }: EventDetailSheetProps) {
   const c = useColors();
+  const activeEmail = useAccountStore((s) => s.getActiveAccount()?.email ?? null);
+  const [rsvpBusy, setRsvpBusy] = React.useState(false);
   const styles = React.useMemo(() => makeStyles(c), [c]);
   const slideY = React.useRef(new Animated.Value(Dimensions.get('window').height)).current;
   const overlayOpacity = React.useRef(new Animated.Value(0)).current;
@@ -158,8 +158,26 @@ export function EventDetailSheet({
   const calendar = calendars.find((c) => c.id === calendarId);
   const range = formatRange(event);
   const recurrence = recurrenceLabel(event);
-  const alert = alertLabel(event);
+  const reminders = alertsToReminders(event.alerts);
   const participants = event.participants ? Object.values(event.participants) : [];
+  const location = event.locations ? Object.values(event.locations)[0]?.name : undefined;
+  const videoUri = event.virtualLocations ? Object.values(event.virtualLocations)[0]?.uri : undefined;
+
+  // Can the signed-in user RSVP? Only when they appear as a non-organizer
+  // participant and the caller wired an onRsvp handler.
+  const me = activeEmail ? findParticipantByEmail(event, [activeEmail]) : null;
+  const canRsvp = Boolean(onRsvp && me && !isOrganizerParticipant(me.participant));
+  const myStatus = me?.participant.participationStatus;
+
+  const doRsvp = async (status: RsvpStatus) => {
+    if (!onRsvp || !me || rsvpBusy) return;
+    setRsvpBusy(true);
+    try {
+      await onRsvp(event, me.id, status);
+    } finally {
+      setRsvpBusy(false);
+    }
+  };
 
   return (
     <Modal
@@ -198,6 +216,22 @@ export function EventDetailSheet({
             showsVerticalScrollIndicator={false}
           >
             <DetailRow icon={<Clock size={16} color={c.textMuted} />} text={range} />
+            {location ? (
+              <DetailRow icon={<MapPin size={16} color={c.textMuted} />} text={location} />
+            ) : null}
+            {videoUri ? (
+              <View style={styles.detailRow}>
+                <View style={styles.detailIcon}>
+                  <Video size={16} color={c.textMuted} />
+                </View>
+                <Pressable
+                  style={styles.joinBtn}
+                  onPress={() => { void Linking.openURL(videoUri); }}
+                >
+                  <Text style={styles.joinBtnText}>Join video call</Text>
+                </Pressable>
+              </View>
+            ) : null}
             {event.description ? (
               <DetailRow
                 icon={<AlignLeft size={16} color={c.textMuted} />}
@@ -211,10 +245,10 @@ export function EventDetailSheet({
                 text={recurrence}
               />
             )}
-            {alert && (
+            {reminders.length > 0 && (
               <DetailRow
                 icon={<Bell size={16} color={c.textMuted} />}
-                text={alert}
+                text={reminders.map((r) => formatReminder(r.minutesBefore)).join(', ')}
               />
             )}
             {calendar && (
@@ -224,6 +258,38 @@ export function EventDetailSheet({
               />
             )}
 
+            {canRsvp && (
+              <View style={styles.rsvpBlock}>
+                <Text style={styles.rsvpPrompt}>Going?</Text>
+                <View style={styles.rsvpButtons}>
+                  <RsvpButton
+                    label="Yes"
+                    icon={<Check size={16} color={myStatus === 'accepted' ? c.textInverse : c.success} />}
+                    active={myStatus === 'accepted'}
+                    activeColor={c.success}
+                    disabled={rsvpBusy}
+                    onPress={() => doRsvp('accepted')}
+                  />
+                  <RsvpButton
+                    label="Maybe"
+                    icon={<HelpCircle size={16} color={myStatus === 'tentative' ? c.textInverse : c.warning} />}
+                    active={myStatus === 'tentative'}
+                    activeColor={c.warning}
+                    disabled={rsvpBusy}
+                    onPress={() => doRsvp('tentative')}
+                  />
+                  <RsvpButton
+                    label="No"
+                    icon={<X size={16} color={myStatus === 'declined' ? c.textInverse : c.error} />}
+                    active={myStatus === 'declined'}
+                    activeColor={c.error}
+                    disabled={rsvpBusy}
+                    onPress={() => doRsvp('declined')}
+                  />
+                </View>
+              </View>
+            )}
+
             {participants.length > 0 && (
               <View style={styles.participantsBlock}>
                 <View style={styles.participantsHeader}>
@@ -334,6 +400,39 @@ function ActionButton({
   );
 }
 
+function RsvpButton({
+  label,
+  icon,
+  active,
+  activeColor,
+  disabled,
+  onPress,
+}: {
+  label: string;
+  icon: React.ReactNode;
+  active: boolean;
+  activeColor: string;
+  disabled?: boolean;
+  onPress: () => void;
+}) {
+  const c = useColors();
+  const styles = React.useMemo(() => makeStyles(c), [c]);
+  return (
+    <Pressable
+      onPress={onPress}
+      disabled={disabled}
+      style={[
+        styles.rsvpBtn,
+        active && { backgroundColor: activeColor, borderColor: activeColor },
+        disabled && { opacity: 0.5 },
+      ]}
+    >
+      {icon}
+      <Text style={[styles.rsvpBtnText, active && { color: c.textInverse }]}>{label}</Text>
+    </Pressable>
+  );
+}
+
 function statusColor(c: ThemePalette, status?: string): string {
   switch (status) {
     case 'accepted':
@@ -417,6 +516,33 @@ function makeStyles(c: ThemePalette) {
   detailIcon: { width: 16, paddingTop: 2 },
   detailText: { flex: 1, ...typography.body, color: c.text },
 
+  joinBtn: {
+    flex: 1,
+    alignSelf: 'flex-start',
+    paddingHorizontal: spacing.md,
+    paddingVertical: spacing.xs,
+    borderRadius: radius.sm,
+    backgroundColor: c.primaryBg,
+  },
+  joinBtnText: { ...typography.bodyMedium, color: c.primary },
+
+  rsvpBlock: { gap: spacing.sm, marginTop: spacing.xs },
+  rsvpPrompt: { ...typography.bodyMedium, color: c.text },
+  rsvpButtons: { flexDirection: 'row', gap: spacing.sm },
+  rsvpBtn: {
+    flex: 1,
+    flexDirection: 'row',
+    alignItems: 'center',
+    justifyContent: 'center',
+    gap: spacing.xs,
+    paddingVertical: spacing.sm,
+    borderRadius: radius.sm,
+    borderWidth: 1,
+    borderColor: c.border,
+    backgroundColor: c.surface,
+  },
+  rsvpBtnText: { ...typography.caption, color: c.text },
+
   participantsBlock: {
     marginTop: spacing.sm,
     gap: spacing.xs,
diff --git a/src/components/calendar/EventModal.tsx b/src/components/calendar/EventModal.tsx
index d484d9d4..a4fa44b9 100644
--- a/src/components/calendar/EventModal.tsx
+++ b/src/components/calendar/EventModal.tsx
@@ -17,13 +17,22 @@ import {
   Calendar as CalendarIcon,
   Clock,
   MapPin,
+  Video,
   Repeat,
   Bell,
+  Plus,
   Users,
   Trash2,
+  AlignLeft,
 } from 'lucide-react-native';
 import { addHours, addMinutes, format } from 'date-fns';
-import type { Calendar, CalendarEvent, Participant } from '../../api/types';
+import type {
+  Calendar,
+  CalendarEvent,
+  Participant,
+  EventLocation,
+  VirtualLocation,
+} from '../../api/types';
 import { radius, spacing, typography, type ThemePalette } from '../../theme/tokens';
 import { useColors } from '../../theme/colors';
 import {
@@ -33,11 +42,17 @@ import {
   getEventStartDate,
   getPrimaryCalendarId,
 } from '../../lib/calendar-utils';
+import {
+  alertsToReminders,
+  remindersToAlerts,
+  formatReminder,
+  REMINDER_PRESETS,
+  type Reminder,
+} from '../../lib/calendar-alerts';
 import { Button } from '..';
 import { ParticipantInput } from './ParticipantInput';
 
 type RecurrenceOption = 'none' | 'daily' | 'weekly' | 'monthly' | 'yearly';
-type AlertOption = 'none' | 'at_time' | '5' | '15' | '30' | '60' | '1440';
 
 const RECURRENCE_OPTIONS: { value: RecurrenceOption; label: string }[] = [
   { value: 'none', label: 'Does not repeat' },
@@ -47,16 +62,6 @@ const RECURRENCE_OPTIONS: { value: RecurrenceOption; label: string }[] = [
   { value: 'yearly', label: 'Yearly' },
 ];
 
-const ALERT_OPTIONS: { value: AlertOption; label: string }[] = [
-  { value: 'none', label: 'No reminder' },
-  { value: 'at_time', label: 'At time of event' },
-  { value: '5', label: '5 minutes before' },
-  { value: '15', label: '15 minutes before' },
-  { value: '30', label: '30 minutes before' },
-  { value: '60', label: '1 hour before' },
-  { value: '1440', label: '1 day before' },
-];
-
 interface EventModalProps {
   visible: boolean;
   event?: CalendarEvent | null;
@@ -101,39 +106,30 @@ function detectRecurrence(event: CalendarEvent | null | undefined): RecurrenceOp
   return 'none';
 }
 
-function detectAlert(event: CalendarEvent | null | undefined): AlertOption {
-  const alerts = event?.alerts;
-  if (!alerts) return 'none';
-  const first = Object.values(alerts)[0];
-  if (!first) return 'none';
-  const offset = first.trigger?.offset;
-  if (!offset) return 'none';
-  if (offset === 'PT0S' || offset === '-PT0S') return 'at_time';
-  const min = offset.match(/-?PT(\d+)M$/);
-  if (min) {
-    const v = min[1];
-    if (v === '5' || v === '15' || v === '30') return v as AlertOption;
-  }
-  const hr = offset.match(/-?PT(\d+)H$/);
-  if (hr && hr[1] === '1') return '60';
-  const day = offset.match(/-?P(\d+)D/);
-  if (day && day[1] === '1') return '1440';
-  return 'none';
+function detectLocation(event: CalendarEvent | null | undefined): string {
+  const locations = event?.locations;
+  if (!locations) return '';
+  const first = Object.values(locations)[0];
+  return first?.name || '';
 }
 
-function alertFromOption(opt: AlertOption): CalendarEvent['alerts'] | undefined {
-  if (opt === 'none') return undefined;
-  let offset = '-PT0M';
-  if (opt === 'at_time') offset = 'PT0S';
-  else if (opt === '60') offset = '-PT1H';
-  else if (opt === '1440') offset = '-P1D';
-  else offset = `-PT${opt}M`;
-  return {
-    'a-1': {
-      trigger: { '@type': 'OffsetTrigger', offset },
-      action: 'display',
-    },
-  };
+function detectVideoUrl(event: CalendarEvent | null | undefined): string {
+  const v = event?.virtualLocations;
+  if (!v) return '';
+  const first = Object.values(v)[0];
+  return first?.uri || '';
+}
+
+function buildLocations(name: string): Record<string, EventLocation> | undefined {
+  const trimmed = name.trim();
+  if (!trimmed) return undefined;
+  return { 'loc-1': { '@type': 'Location', name: trimmed } };
+}
+
+function buildVirtualLocations(uri: string): Record<string, VirtualLocation> | undefined {
+  const trimmed = uri.trim();
+  if (!trimmed) return undefined;
+  return { 'vloc-1': { '@type': 'VirtualLocation', name: 'Video call', uri: trimmed } };
 }
 
 function recurrenceFromOption(opt: RecurrenceOption): CalendarEvent['recurrenceRules'] | undefined {
@@ -163,9 +159,11 @@ export function EventModal({
   const [calendarId, setCalendarId] = React.useState<string>(defaultCalendarId || calendars[0]?.id || '');
   const [participants, setParticipants] = React.useState<Record<string, Participant>>({});
   const [recurrence, setRecurrence] = React.useState<RecurrenceOption>('none');
-  const [alert, setAlert] = React.useState<AlertOption>('none');
+  const [reminders, setReminders] = React.useState<Reminder[]>([]);
+  const [location, setLocation] = React.useState('');
+  const [videoUrl, setVideoUrl] = React.useState('');
   const [recurrenceOpen, setRecurrenceOpen] = React.useState(false);
-  const [alertOpen, setAlertOpen] = React.useState(false);
+  const [reminderPickerOpen, setReminderPickerOpen] = React.useState(false);
   const [calendarOpen, setCalendarOpen] = React.useState(false);
   const [showStartDate, setShowStartDate] = React.useState(false);
   const [showStartTime, setShowStartTime] = React.useState(false);
@@ -184,7 +182,9 @@ export function EventModal({
       setCalendarId(getPrimaryCalendarId(event) || calendars[0]?.id || '');
       setParticipants(event.participants || {});
       setRecurrence(detectRecurrence(event));
-      setAlert(detectAlert(event));
+      setReminders(alertsToReminders(event.alerts));
+      setLocation(detectLocation(event));
+      setVideoUrl(detectVideoUrl(event));
     } else {
       const d = defaultDate ? nextHalfHour(defaultDate) : nextHalfHour(new Date());
       setTitle('');
@@ -195,7 +195,9 @@ export function EventModal({
       setCalendarId(defaultCalendarId || calendars[0]?.id || '');
       setParticipants({});
       setRecurrence('none');
-      setAlert('none');
+      setReminders([]);
+      setLocation('');
+      setVideoUrl('');
     }
   }, [visible, event, defaultDate, defaultCalendarId, calendars]);
 
@@ -240,7 +242,10 @@ export function EventModal({
         duration: allDay ? buildAllDayDuration(start, end) : buildDuration(start, end),
         participants: Object.keys(participants).length > 0 ? participants : undefined,
         recurrenceRules: recurrenceFromOption(recurrence),
-        alerts: alertFromOption(alert),
+        alerts: remindersToAlerts(reminders),
+        useDefaultAlerts: reminders.length > 0 ? false : undefined,
+        locations: buildLocations(location),
+        virtualLocations: buildVirtualLocations(videoUrl),
       };
       await onSave(data, calendarId);
       onClose();
@@ -255,7 +260,21 @@ export function EventModal({
 
   const selectedCalendar = calendars.find((c) => c.id === calendarId);
   const recurrenceLabel = RECURRENCE_OPTIONS.find((o) => o.value === recurrence)?.label || 'None';
-  const alertLabel = ALERT_OPTIONS.find((o) => o.value === alert)?.label || 'None';
+
+  const addReminder = (minutesBefore: number) => {
+    setReminderPickerOpen(false);
+    setReminders((prev) =>
+      prev.some((r) => r.minutesBefore === minutesBefore)
+        ? prev
+        : [...prev, { minutesBefore }].sort((a, b) => b.minutesBefore - a.minutesBefore),
+    );
+  };
+  const removeReminder = (minutesBefore: number) => {
+    setReminders((prev) => prev.filter((r) => r.minutesBefore !== minutesBefore));
+  };
+  const availablePresets = REMINDER_PRESETS.filter(
+    (p) => !reminders.some((r) => r.minutesBefore === p),
+  );
 
   return (
     <Modal
@@ -423,42 +442,80 @@ export function EventModal({
             )}
           </Section>
 
-          <Section icon={<Bell size={16} color={c.textMuted} />} label="Reminder">
-            <Pressable
-              style={styles.fieldButton}
-              onPress={() => setAlertOpen((v) => !v)}
-            >
-              <Text style={styles.fieldText}>{alertLabel}</Text>
-            </Pressable>
-            {alertOpen && (
+          <Section icon={<Bell size={16} color={c.textMuted} />} label="Reminders">
+            {reminders.length > 0 && (
+              <View style={{ gap: spacing.xs }}>
+                {reminders.map((r) => (
+                  <View key={r.minutesBefore} style={styles.reminderRow}>
+                    <Text style={styles.fieldText}>{formatReminder(r.minutesBefore)}</Text>
+                    <Pressable
+                      onPress={() => removeReminder(r.minutesBefore)}
+                      hitSlop={8}
+                      style={styles.reminderRemove}
+                    >
+                      <X size={16} color={c.textMuted} />
+                    </Pressable>
+                  </View>
+                ))}
+              </View>
+            )}
+            {availablePresets.length > 0 && (
+              <Pressable
+                style={styles.addRow}
+                onPress={() => setReminderPickerOpen((v) => !v)}
+              >
+                <Plus size={16} color={c.primary} />
+                <Text style={styles.addRowText}>
+                  {reminders.length === 0 ? 'Add reminder' : 'Add another reminder'}
+                </Text>
+              </Pressable>
+            )}
+            {reminderPickerOpen && (
               <View style={styles.popover}>
-                {ALERT_OPTIONS.map((opt) => (
+                {availablePresets.map((preset) => (
                   <Pressable
-                    key={opt.value}
-                    style={[
-                      styles.popoverRow,
-                      opt.value === alert && styles.popoverRowActive,
-                    ]}
-                    onPress={() => {
-                      setAlert(opt.value);
-                      setAlertOpen(false);
-                    }}
+                    key={preset}
+                    style={styles.popoverRow}
+                    onPress={() => addReminder(preset)}
                   >
-                    <Text style={styles.popoverRowText}>{opt.label}</Text>
+                    <Text style={styles.popoverRowText}>{formatReminder(preset)}</Text>
                   </Pressable>
                 ))}
               </View>
             )}
           </Section>
 
+          <Section icon={<MapPin size={16} color={c.textMuted} />} label="Location">
+            <TextInput
+              value={location}
+              onChangeText={setLocation}
+              placeholder="Place or address"
+              placeholderTextColor={c.textMuted}
+              style={styles.fieldButton}
+            />
+          </Section>
+
+          <Section icon={<Video size={16} color={c.textMuted} />} label="Video call">
+            <TextInput
+              value={videoUrl}
+              onChangeText={setVideoUrl}
+              placeholder="https://meet.example.com/…"
+              placeholderTextColor={c.textMuted}
+              autoCapitalize="none"
+              autoCorrect={false}
+              keyboardType="url"
+              style={styles.fieldButton}
+            />
+          </Section>
+
           <Section
-            icon={<MapPin size={16} color={c.textMuted} />}
+            icon={<AlignLeft size={16} color={c.textMuted} />}
             label="Description"
           >
             <TextInput
               value={description}
               onChangeText={setDescription}
-              placeholder="Notes, location, link…"
+              placeholder="Notes, agenda…"
               placeholderTextColor={c.textMuted}
               multiline
               style={styles.descriptionInput}
@@ -629,6 +686,26 @@ function makeStyles(c: ThemePalette) {
   calendarRow: { flexDirection: 'row', alignItems: 'center', gap: spacing.sm },
   calendarSwatch: { width: 12, height: 12, borderRadius: 6 },
 
+  reminderRow: {
+    flexDirection: 'row',
+    alignItems: 'center',
+    justifyContent: 'space-between',
+    paddingHorizontal: spacing.md,
+    paddingVertical: spacing.sm,
+    borderRadius: radius.sm,
+    borderWidth: 1,
+    borderColor: c.border,
+    backgroundColor: c.surface,
+  },
+  reminderRemove: { padding: 2 },
+  addRow: {
+    flexDirection: 'row',
+    alignItems: 'center',
+    gap: spacing.sm,
+    paddingVertical: spacing.sm,
+  },
+  addRowText: { ...typography.body, color: c.primary },
+
   popover: {
     borderWidth: 1,
     borderColor: c.border,
diff --git a/src/components/calendar/ICalImportSheet.tsx b/src/components/calendar/ICalImportSheet.tsx
new file mode 100644
index 00000000..72121d65
--- /dev/null
+++ b/src/components/calendar/ICalImportSheet.tsx
@@ -0,0 +1,391 @@
+import React from 'react';
+import {
+  View, Text, StyleSheet, ScrollView, Pressable, Modal, Animated, Easing, Alert, ActivityIndicator,
+} from 'react-native';
+import { SafeAreaView, useSafeAreaInsets } from 'react-native-safe-area-context';
+import { Upload, X, Check, CalendarPlus, AlertTriangle, Clock } from 'lucide-react-native';
+import { format, parseISO } from 'date-fns';
+import type { Calendar, CalendarEvent } from '../../api/types';
+import { uploadBlob } from '../../api/blob';
+import { parseCalendarBlob } from '../../api/calendar';
+import Button from '../Button';
+import { spacing, radius, typography, type ThemePalette } from '../../theme/tokens';
+import { useColors } from '../../theme/colors';
+import { getCalendarColor } from '../../lib/calendar-utils';
+
+// expo-document-picker is loaded lazily on first use; its native module is not
+// linked into every build (matches the FilesScreen / ContactImportSheet flow).
+type DocumentPickerModule = typeof import('expo-document-picker');
+let documentPickerModule: DocumentPickerModule | null = null;
+function loadDocumentPicker(): DocumentPickerModule | null {
+  if (documentPickerModule) return documentPickerModule;
+  try {
+    documentPickerModule = require('expo-document-picker') as DocumentPickerModule;
+    return documentPickerModule;
+  } catch {
+    return null;
+  }
+}
+
+interface Props {
+  visible: boolean;
+  onClose: () => void;
+  calendars: Calendar[];
+  /** Imports the selected events into the chosen calendar; returns count. */
+  onImport: (events: Partial<CalendarEvent>[], calendarId: string) => Promise<number>;
+  onImported?: (count: number) => void;
+}
+
+function eventDateLabel(event: Partial<CalendarEvent>): string | null {
+  if (!event.start) return null;
+  const d = parseISO(event.start);
+  if (isNaN(d.getTime())) return null;
+  return event.showWithoutTime ? format(d, 'EEE, MMM d, yyyy') : format(d, 'EEE, MMM d · HH:mm');
+}
+
+export function ICalImportSheet({ visible, onClose, calendars, onImport, onImported }: Props) {
+  const c = useColors();
+  const styles = React.useMemo(() => makeStyles(c), [c]);
+  const insets = useSafeAreaInsets();
+
+  const writable = React.useMemo(
+    () => calendars.filter((cal) => !cal.myRights || cal.myRights.mayWrite !== false),
+    [calendars],
+  );
+
+  const [parsed, setParsed] = React.useState<Partial<CalendarEvent>[]>([]);
+  const [selected, setSelected] = React.useState<Set<number>>(new Set());
+  const [calendarId, setCalendarId] = React.useState('');
+  const [error, setError] = React.useState<string | null>(null);
+  const [loading, setLoading] = React.useState(false);
+  const [importing, setImporting] = React.useState(false);
+  const [result, setResult] = React.useState<number | null>(null);
+
+  const slideY = React.useRef(new Animated.Value(900)).current;
+  const overlayOpacity = React.useRef(new Animated.Value(0)).current;
+
+  const resetState = React.useCallback(() => {
+    setParsed([]);
+    setSelected(new Set());
+    setError(null);
+    setLoading(false);
+    setImporting(false);
+    setResult(null);
+  }, []);
+
+  React.useEffect(() => {
+    if (visible) {
+      resetState();
+      if (writable[0]) setCalendarId(writable[0].id);
+      Animated.parallel([
+        Animated.timing(slideY, { toValue: 0, duration: 240, easing: Easing.out(Easing.cubic), useNativeDriver: true }),
+        Animated.timing(overlayOpacity, { toValue: 1, duration: 240, useNativeDriver: true }),
+      ]).start();
+    } else {
+      Animated.parallel([
+        Animated.timing(slideY, { toValue: 900, duration: 200, easing: Easing.in(Easing.cubic), useNativeDriver: true }),
+        Animated.timing(overlayOpacity, { toValue: 0, duration: 200, useNativeDriver: true }),
+      ]).start();
+    }
+    // eslint-disable-next-line react-hooks/exhaustive-deps
+  }, [visible, slideY, overlayOpacity, resetState]);
+
+  const pickFile = async () => {
+    const picker = loadDocumentPicker();
+    if (!picker) {
+      Alert.alert(
+        'Import unavailable',
+        'The file picker is not installed in this build. Rebuild the app (expo run:android) to enable importing.',
+      );
+      return;
+    }
+    setError(null);
+    let res;
+    try {
+      res = await picker.getDocumentAsync({ copyToCacheDirectory: true, multiple: false });
+    } catch (e) {
+      setError(e instanceof Error ? e.message : 'Could not open the file picker');
+      return;
+    }
+    if (res.canceled || res.assets.length === 0) return;
+    const asset = res.assets[0];
+    if (asset.size && asset.size > 5 * 1024 * 1024) {
+      setError('That file is too large (max 5 MB).');
+      return;
+    }
+
+    setLoading(true);
+    try {
+      // Upload the .ics so the server can parse it (CalendarEvent/parse).
+      const { blobId } = await uploadBlob(asset.uri, 'text/calendar');
+      const events = await parseCalendarBlob(blobId);
+      const usable = events.filter((e) => !!e.start || e['@type'] === 'Task');
+      if (usable.length === 0) {
+        setError('No events were found in that file.');
+        return;
+      }
+      setParsed(usable);
+      setSelected(new Set(usable.map((_, i) => i)));
+    } catch (e) {
+      setError(e instanceof Error ? e.message : 'Could not read or parse that file.');
+    } finally {
+      setLoading(false);
+    }
+  };
+
+  const toggle = (idx: number) => {
+    setSelected((prev) => {
+      const next = new Set(prev);
+      if (next.has(idx)) next.delete(idx);
+      else next.add(idx);
+      return next;
+    });
+  };
+  const selectAll = () => setSelected(new Set(parsed.map((_, i) => i)));
+  const selectNone = () => setSelected(new Set());
+
+  const doImport = async () => {
+    if (!calendarId) {
+      Alert.alert('No calendar', 'Create a calendar before importing events.');
+      return;
+    }
+    const toImport = parsed.filter((_, i) => selected.has(i));
+    if (toImport.length === 0) return;
+    setImporting(true);
+    try {
+      const count = await onImport(toImport, calendarId);
+      setResult(count);
+      onImported?.(count);
+    } catch (e) {
+      setError(e instanceof Error ? e.message : 'Import failed.');
+    } finally {
+      setImporting(false);
+    }
+  };
+
+  return (
+    <Modal visible={visible} transparent animationType="none" onRequestClose={onClose} statusBarTranslucent>
+      <Animated.View style={[styles.overlay, { opacity: overlayOpacity }]}>
+        <Pressable style={{ flex: 1 }} onPress={onClose} />
+      </Animated.View>
+      <Animated.View style={[styles.sheet, { transform: [{ translateY: slideY }] }]}>
+        <SafeAreaView edges={['bottom']} style={{ flex: 1 }}>
+          <View style={styles.header}>
+            <Text style={styles.title}>Import calendar</Text>
+            <Pressable onPress={onClose} hitSlop={8} style={styles.close}>
+              <X size={20} color={c.text} />
+            </Pressable>
+          </View>
+
+          {result !== null ? (
+            <View style={styles.center}>
+              <View style={styles.successBadge}>
+                <Check size={26} color={c.primaryForeground} />
+              </View>
+              <Text style={styles.successText}>
+                Imported {result} event{result === 1 ? '' : 's'}.
+              </Text>
+              <Button variant="outline" size="sm" onPress={onClose}>Done</Button>
+            </View>
+          ) : parsed.length === 0 ? (
+            <View style={styles.center}>
+              <Pressable style={styles.dropZone} onPress={() => { void pickFile(); }} disabled={loading}>
+                {loading ? (
+                  <ActivityIndicator color={c.primary} />
+                ) : (
+                  <Upload size={32} color={c.textMuted} />
+                )}
+                <Text style={styles.dropTitle}>{loading ? 'Parsing…' : 'Choose an .ics file'}</Text>
+                <Text style={styles.dropHint}>iCalendar — single or multiple events</Text>
+              </Pressable>
+              {!!error && (
+                <View style={styles.errorBox}>
+                  <AlertTriangle size={16} color={c.error} />
+                  <Text style={styles.errorText}>{error}</Text>
+                </View>
+              )}
+            </View>
+          ) : (
+            <>
+              {writable.length > 1 && (
+                <ScrollView horizontal showsHorizontalScrollIndicator={false} contentContainerStyle={styles.calChips}>
+                  {writable.map((cal) => (
+                    <Pressable
+                      key={cal.id}
+                      onPress={() => setCalendarId(cal.id)}
+                      style={[styles.calChip, cal.id === calendarId && styles.calChipActive]}
+                    >
+                      <View style={[styles.calSwatch, { backgroundColor: getCalendarColor(cal) }]} />
+                      <Text style={styles.calChipText} numberOfLines={1}>{cal.name}</Text>
+                    </Pressable>
+                  ))}
+                </ScrollView>
+              )}
+
+              <View style={styles.toolbar}>
+                <Text style={styles.toolbarCount}>
+                  {parsed.length} found · {selected.size} selected
+                </Text>
+                <View style={{ flexDirection: 'row', gap: spacing.md }}>
+                  <Pressable onPress={selectAll} hitSlop={6}><Text style={styles.link}>All</Text></Pressable>
+                  <Pressable onPress={selectNone} hitSlop={6}><Text style={styles.link}>None</Text></Pressable>
+                </View>
+              </View>
+
+              <ScrollView style={{ flex: 1 }}>
+                {parsed.map((event, idx) => {
+                  const isSelected = selected.has(idx);
+                  const date = eventDateLabel(event);
+                  return (
+                    <Pressable
+                      key={idx}
+                      onPress={() => toggle(idx)}
+                      style={({ pressed }) => [styles.row, pressed && styles.rowPressed]}
+                    >
+                      <View style={[styles.checkbox, isSelected && styles.checkboxOn]}>
+                        {isSelected && <Check size={13} color={c.primaryForeground} />}
+                      </View>
+                      <Clock size={16} color={c.textMuted} />
+                      <View style={{ flex: 1, minWidth: 0 }}>
+                        <Text style={styles.rowName} numberOfLines={1}>{event.title || 'Untitled event'}</Text>
+                        {!!date && <Text style={styles.rowDate} numberOfLines={1}>{date}</Text>}
+                      </View>
+                    </Pressable>
+                  );
+                })}
+              </ScrollView>
+
+              {!!error && (
+                <View style={styles.errorBox}>
+                  <AlertTriangle size={16} color={c.error} />
+                  <Text style={styles.errorText}>{error}</Text>
+                </View>
+              )}
+
+              <View style={[styles.footer, { paddingBottom: Math.max(insets.bottom, spacing.md) }]}>
+                <Button variant="outline" onPress={onClose} disabled={importing}>Cancel</Button>
+                <Button
+                  onPress={() => { void doImport(); }}
+                  disabled={importing || selected.size === 0}
+                  icon={importing ? <ActivityIndicator size="small" color={c.primaryForeground} /> : <CalendarPlus size={16} color={c.primaryForeground} />}
+                >
+                  {importing ? 'Importing…' : `Import ${selected.size}`}
+                </Button>
+              </View>
+            </>
+          )}
+        </SafeAreaView>
+      </Animated.View>
+    </Modal>
+  );
+}
+
+function makeStyles(c: ThemePalette) {
+  return StyleSheet.create({
+    overlay: { ...StyleSheet.absoluteFillObject, backgroundColor: 'rgba(0,0,0,0.5)' },
+    sheet: {
+      position: 'absolute',
+      left: 0,
+      right: 0,
+      bottom: 0,
+      height: '85%',
+      backgroundColor: c.popover,
+      borderTopLeftRadius: radius.lg,
+      borderTopRightRadius: radius.lg,
+      borderTopWidth: 1,
+      borderColor: c.border,
+    },
+    header: {
+      flexDirection: 'row',
+      alignItems: 'center',
+      justifyContent: 'space-between',
+      paddingHorizontal: spacing.lg,
+      paddingVertical: spacing.md,
+      borderBottomWidth: 1,
+      borderBottomColor: c.border,
+    },
+    title: { ...typography.h3, color: c.text },
+    close: { width: 36, height: 36, alignItems: 'center', justifyContent: 'center', borderRadius: radius.sm },
+    center: { flex: 1, alignItems: 'center', justifyContent: 'center', gap: spacing.lg, padding: spacing.xl },
+    dropZone: {
+      width: '100%',
+      borderWidth: 2,
+      borderColor: c.border,
+      borderStyle: 'dashed',
+      borderRadius: radius.lg,
+      paddingVertical: spacing.xxxl,
+      alignItems: 'center',
+      gap: spacing.sm,
+    },
+    dropTitle: { ...typography.bodyMedium, color: c.text },
+    dropHint: { ...typography.caption, color: c.textMuted },
+    successBadge: {
+      width: 56, height: 56, borderRadius: radius.full,
+      backgroundColor: c.primary, alignItems: 'center', justifyContent: 'center',
+    },
+    successText: { ...typography.bodyMedium, color: c.text },
+    calChips: { paddingHorizontal: spacing.lg, paddingVertical: spacing.sm, gap: spacing.sm },
+    calChip: {
+      flexDirection: 'row',
+      alignItems: 'center',
+      gap: spacing.xs,
+      paddingHorizontal: spacing.sm,
+      paddingVertical: spacing.xs,
+      borderRadius: radius.full,
+      borderWidth: 1,
+      borderColor: c.border,
+      maxWidth: 160,
+    },
+    calChipActive: { borderColor: c.primary, backgroundColor: c.primaryBg },
+    calSwatch: { width: 10, height: 10, borderRadius: 5 },
+    calChipText: { ...typography.caption, color: c.text, flexShrink: 1 },
+    toolbar: {
+      flexDirection: 'row',
+      alignItems: 'center',
+      justifyContent: 'space-between',
+      paddingHorizontal: spacing.lg,
+      paddingVertical: spacing.sm,
+    },
+    toolbarCount: { ...typography.caption, color: c.textMuted },
+    link: { ...typography.captionMedium, color: c.primary },
+    row: {
+      flexDirection: 'row',
+      alignItems: 'center',
+      gap: spacing.md,
+      paddingHorizontal: spacing.lg,
+      paddingVertical: spacing.sm + 2,
+      minHeight: 48,
+    },
+    rowPressed: { backgroundColor: c.surfaceHover },
+    checkbox: {
+      width: 20, height: 20, borderRadius: radius.xs,
+      borderWidth: 1, borderColor: c.border,
+      alignItems: 'center', justifyContent: 'center',
+    },
+    checkboxOn: { backgroundColor: c.primary, borderColor: c.primary },
+    rowName: { ...typography.body, color: c.text },
+    rowDate: { ...typography.caption, color: c.textMuted, marginTop: 1 },
+    errorBox: {
+      flexDirection: 'row',
+      alignItems: 'center',
+      gap: spacing.sm,
+      marginHorizontal: spacing.lg,
+      marginTop: spacing.sm,
+      padding: spacing.md,
+      borderRadius: radius.sm,
+      backgroundColor: c.errorBg,
+      borderWidth: 1,
+      borderColor: c.errorBorder,
+    },
+    errorText: { ...typography.caption, color: c.errorForeground, flex: 1 },
+    footer: {
+      flexDirection: 'row',
+      justifyContent: 'flex-end',
+      gap: spacing.md,
+      paddingHorizontal: spacing.lg,
+      paddingTop: spacing.md,
+      borderTopWidth: 1,
+      borderTopColor: c.border,
+    },
+  });
+}
diff --git a/src/components/calendar/ICalSubscriptionSheet.tsx b/src/components/calendar/ICalSubscriptionSheet.tsx
new file mode 100644
index 00000000..495eeee5
--- /dev/null
+++ b/src/components/calendar/ICalSubscriptionSheet.tsx
@@ -0,0 +1,262 @@
+import React from 'react';
+import {
+  View, Text, StyleSheet, ScrollView, Pressable, Modal, Animated, Easing, TextInput, ActivityIndicator,
+} from 'react-native';
+import { SafeAreaView, useSafeAreaInsets } from 'react-native-safe-area-context';
+import { X, Plus, RefreshCw, Trash2, Rss, AlertTriangle } from 'lucide-react-native';
+import { formatDistanceToNow } from 'date-fns';
+import Button from '../Button';
+import { spacing, radius, typography, type ThemePalette } from '../../theme/tokens';
+import { useColors } from '../../theme/colors';
+import { CALENDAR_COLOR_PALETTE } from '../../lib/calendar-utils';
+import { useCalendarSubscriptionsStore } from '../../stores/calendar-subscriptions-store';
+
+interface Props {
+  visible: boolean;
+  onClose: () => void;
+}
+
+export function ICalSubscriptionSheet({ visible, onClose }: Props) {
+  const c = useColors();
+  const styles = React.useMemo(() => makeStyles(c), [c]);
+  const insets = useSafeAreaInsets();
+  const subscriptions = useCalendarSubscriptionsStore((s) => s.subscriptions);
+  const syncing = useCalendarSubscriptionsStore((s) => s.syncing);
+  const addSubscription = useCalendarSubscriptionsStore((s) => s.addSubscription);
+  const removeSubscription = useCalendarSubscriptionsStore((s) => s.removeSubscription);
+  const syncSubscription = useCalendarSubscriptionsStore((s) => s.syncSubscription);
+
+  const [name, setName] = React.useState('');
+  const [url, setUrl] = React.useState('');
+  const [color, setColor] = React.useState<string>(CALENDAR_COLOR_PALETTE[0]);
+  const [adding, setAdding] = React.useState(false);
+  const [formError, setFormError] = React.useState<string | null>(null);
+
+  const slideY = React.useRef(new Animated.Value(900)).current;
+  const overlayOpacity = React.useRef(new Animated.Value(0)).current;
+
+  React.useEffect(() => {
+    if (visible) {
+      setName('');
+      setUrl('');
+      setColor(CALENDAR_COLOR_PALETTE[0]);
+      setFormError(null);
+      Animated.parallel([
+        Animated.timing(slideY, { toValue: 0, duration: 240, easing: Easing.out(Easing.cubic), useNativeDriver: true }),
+        Animated.timing(overlayOpacity, { toValue: 1, duration: 240, useNativeDriver: true }),
+      ]).start();
+    } else {
+      Animated.parallel([
+        Animated.timing(slideY, { toValue: 900, duration: 200, easing: Easing.in(Easing.cubic), useNativeDriver: true }),
+        Animated.timing(overlayOpacity, { toValue: 0, duration: 200, useNativeDriver: true }),
+      ]).start();
+    }
+  }, [visible, slideY, overlayOpacity]);
+
+  const handleAdd = async () => {
+    const n = name.trim();
+    const u = url.trim();
+    if (!n || !u) {
+      setFormError('Enter a name and a feed URL.');
+      return;
+    }
+    if (!/^(https?|webcal):\/\//i.test(u)) {
+      setFormError('URL must start with https://, http:// or webcal://');
+      return;
+    }
+    setFormError(null);
+    setAdding(true);
+    try {
+      const sub = await addSubscription({ name: n, url: u, color });
+      if (sub.lastError) {
+        setFormError(sub.lastError);
+      } else {
+        setName('');
+        setUrl('');
+      }
+    } catch (e) {
+      setFormError(e instanceof Error ? e.message : 'Could not add subscription.');
+    } finally {
+      setAdding(false);
+    }
+  };
+
+  return (
+    <Modal visible={visible} transparent animationType="none" onRequestClose={onClose} statusBarTranslucent>
+      <Animated.View style={[styles.overlay, { opacity: overlayOpacity }]}>
+        <Pressable style={{ flex: 1 }} onPress={onClose} />
+      </Animated.View>
+      <Animated.View style={[styles.sheet, { transform: [{ translateY: slideY }] }]}>
+        <SafeAreaView edges={['bottom']} style={{ flex: 1 }}>
+          <View style={styles.header}>
+            <Rss size={20} color={c.text} />
+            <Text style={styles.title}>Calendar subscriptions</Text>
+            <Pressable onPress={onClose} hitSlop={8} style={styles.close}>
+              <X size={20} color={c.text} />
+            </Pressable>
+          </View>
+
+          <ScrollView style={{ flex: 1 }} contentContainerStyle={styles.scroll}>
+            <Text style={styles.sectionLabel}>Add a feed</Text>
+            <TextInput
+              value={name}
+              onChangeText={setName}
+              placeholder="Name (e.g. Holidays)"
+              placeholderTextColor={c.textMuted}
+              style={styles.input}
+            />
+            <TextInput
+              value={url}
+              onChangeText={setUrl}
+              placeholder="https://… or webcal://…"
+              placeholderTextColor={c.textMuted}
+              autoCapitalize="none"
+              autoCorrect={false}
+              keyboardType="url"
+              style={styles.input}
+            />
+            <View style={styles.colorRow}>
+              {CALENDAR_COLOR_PALETTE.map((col) => (
+                <Pressable
+                  key={col}
+                  onPress={() => setColor(col)}
+                  style={[
+                    styles.colorDot,
+                    { backgroundColor: col },
+                    color === col && styles.colorDotActive,
+                  ]}
+                />
+              ))}
+            </View>
+            {!!formError && (
+              <View style={styles.errorBox}>
+                <AlertTriangle size={16} color={c.error} />
+                <Text style={styles.errorText}>{formError}</Text>
+              </View>
+            )}
+            <Button
+              onPress={() => { void handleAdd(); }}
+              disabled={adding}
+              icon={adding ? <ActivityIndicator size="small" color={c.primaryForeground} /> : <Plus size={16} color={c.primaryForeground} />}
+            >
+              {adding ? 'Subscribing…' : 'Subscribe'}
+            </Button>
+
+            {subscriptions.length > 0 && (
+              <>
+                <Text style={[styles.sectionLabel, { marginTop: spacing.xl }]}>Your subscriptions</Text>
+                {subscriptions.map((sub) => {
+                  const busy = !!syncing[sub.id];
+                  return (
+                    <View key={sub.id} style={styles.subRow}>
+                      <View style={[styles.subSwatch, { backgroundColor: sub.color || c.primary }]} />
+                      <View style={{ flex: 1, minWidth: 0 }}>
+                        <Text style={styles.subName} numberOfLines={1}>{sub.name}</Text>
+                        <Text style={styles.subMeta} numberOfLines={1}>
+                          {sub.lastError
+                            ? sub.lastError
+                            : sub.lastSyncAt
+                              ? `Synced ${formatDistanceToNow(sub.lastSyncAt, { addSuffix: true })}`
+                              : 'Not synced yet'}
+                        </Text>
+                      </View>
+                      <Pressable
+                        onPress={() => { void syncSubscription(sub.id); }}
+                        hitSlop={6}
+                        style={styles.subBtn}
+                        disabled={busy}
+                      >
+                        {busy ? (
+                          <ActivityIndicator size="small" color={c.textMuted} />
+                        ) : (
+                          <RefreshCw size={16} color={c.textSecondary} />
+                        )}
+                      </Pressable>
+                      <Pressable
+                        onPress={() => { void removeSubscription(sub.id); }}
+                        hitSlop={6}
+                        style={styles.subBtn}
+                      >
+                        <Trash2 size={16} color={c.error} />
+                      </Pressable>
+                    </View>
+                  );
+                })}
+              </>
+            )}
+          </ScrollView>
+          <View style={{ height: insets.bottom }} />
+        </SafeAreaView>
+      </Animated.View>
+    </Modal>
+  );
+}
+
+function makeStyles(c: ThemePalette) {
+  return StyleSheet.create({
+    overlay: { ...StyleSheet.absoluteFillObject, backgroundColor: 'rgba(0,0,0,0.5)' },
+    sheet: {
+      position: 'absolute',
+      left: 0,
+      right: 0,
+      bottom: 0,
+      maxHeight: '88%',
+      backgroundColor: c.popover,
+      borderTopLeftRadius: radius.lg,
+      borderTopRightRadius: radius.lg,
+      borderTopWidth: 1,
+      borderColor: c.border,
+    },
+    header: {
+      flexDirection: 'row',
+      alignItems: 'center',
+      gap: spacing.sm,
+      paddingHorizontal: spacing.lg,
+      paddingVertical: spacing.md,
+      borderBottomWidth: 1,
+      borderBottomColor: c.border,
+    },
+    title: { flex: 1, ...typography.h3, color: c.text },
+    close: { width: 36, height: 36, alignItems: 'center', justifyContent: 'center', borderRadius: radius.sm },
+    scroll: { padding: spacing.lg, gap: spacing.sm },
+    sectionLabel: { ...typography.bodySemibold, color: c.text, marginBottom: spacing.xs },
+    input: {
+      ...typography.body,
+      color: c.text,
+      borderWidth: 1,
+      borderColor: c.border,
+      borderRadius: radius.sm,
+      paddingHorizontal: spacing.md,
+      paddingVertical: spacing.sm,
+      backgroundColor: c.surface,
+      marginBottom: spacing.sm,
+    },
+    colorRow: { flexDirection: 'row', flexWrap: 'wrap', gap: spacing.sm, marginBottom: spacing.md },
+    colorDot: { width: 26, height: 26, borderRadius: 13, borderWidth: 2, borderColor: 'transparent' },
+    colorDotActive: { borderColor: c.text },
+    errorBox: {
+      flexDirection: 'row',
+      alignItems: 'center',
+      gap: spacing.sm,
+      padding: spacing.md,
+      borderRadius: radius.sm,
+      backgroundColor: c.errorBg,
+      borderWidth: 1,
+      borderColor: c.errorBorder,
+      marginBottom: spacing.sm,
+    },
+    errorText: { ...typography.caption, color: c.errorForeground, flex: 1 },
+    subRow: {
+      flexDirection: 'row',
+      alignItems: 'center',
+      gap: spacing.md,
+      paddingVertical: spacing.sm,
+      borderBottomWidth: 1,
+      borderBottomColor: c.borderLight,
+    },
+    subSwatch: { width: 14, height: 14, borderRadius: 7 },
+    subName: { ...typography.body, color: c.text },
+    subMeta: { ...typography.caption, color: c.textMuted, marginTop: 1 },
+    subBtn: { width: 32, height: 32, alignItems: 'center', justifyContent: 'center', borderRadius: radius.sm },
+  });
+}
diff --git a/src/components/calendar/TasksSheet.tsx b/src/components/calendar/TasksSheet.tsx
new file mode 100644
index 00000000..58b040a5
--- /dev/null
+++ b/src/components/calendar/TasksSheet.tsx
@@ -0,0 +1,371 @@
+import React from 'react';
+import {
+  Animated,
+  Dimensions,
+  Easing,
+  Modal,
+  Platform,
+  Pressable,
+  ScrollView,
+  StyleSheet,
+  Text,
+  TextInput,
+  View,
+} from 'react-native';
+import { SafeAreaView } from 'react-native-safe-area-context';
+import DateTimePicker from '@react-native-community/datetimepicker';
+import {
+  Calendar as CalendarIcon,
+  Check,
+  ListChecks,
+  Plus,
+  Trash2,
+  X,
+} from 'lucide-react-native';
+import { format, parseISO } from 'date-fns';
+import type { Calendar, CalendarEvent } from '../../api/types';
+import { radius, spacing, typography, type ThemePalette } from '../../theme/tokens';
+import { useColors } from '../../theme/colors';
+import { getCalendarColor } from '../../lib/calendar-utils';
+import { useSheetDrag } from '../../lib/use-sheet-drag';
+
+interface TasksSheetProps {
+  visible: boolean;
+  tasks: CalendarEvent[];
+  calendars: Calendar[];
+  onClose: () => void;
+  onCreate: (task: Partial<CalendarEvent>, calendarId: string) => Promise<void> | void;
+  onToggle: (id: string) => Promise<void> | void;
+  onDelete: (id: string) => Promise<void> | void;
+}
+
+function isCompleted(task: CalendarEvent): boolean {
+  return task.progress === 'completed';
+}
+
+function dueLabel(task: CalendarEvent): string | null {
+  if (!task.due) return null;
+  const d = parseISO(task.due);
+  if (isNaN(d.getTime())) return null;
+  return format(d, 'EEE, MMM d');
+}
+
+// Tasks first by completion (open first), then by due date (soonest first,
+// undated last), then title.
+function compareTasks(a: CalendarEvent, b: CalendarEvent): number {
+  const ac = isCompleted(a);
+  const bc = isCompleted(b);
+  if (ac !== bc) return ac ? 1 : -1;
+  const ad = a.due ? parseISO(a.due).getTime() : Infinity;
+  const bd = b.due ? parseISO(b.due).getTime() : Infinity;
+  if (ad !== bd) return ad - bd;
+  return (a.title || '').localeCompare(b.title || '');
+}
+
+export function TasksSheet({
+  visible,
+  tasks,
+  calendars,
+  onClose,
+  onCreate,
+  onToggle,
+  onDelete,
+}: TasksSheetProps) {
+  const c = useColors();
+  const styles = React.useMemo(() => makeStyles(c), [c]);
+  const slideY = React.useRef(new Animated.Value(Dimensions.get('window').height)).current;
+  const overlayOpacity = React.useRef(new Animated.Value(0)).current;
+  const dragHandlers = useSheetDrag({
+    slideY,
+    closedY: Dimensions.get('window').height,
+    onClose,
+  });
+
+  const writableCalendars = React.useMemo(
+    () => calendars.filter((cal) => !cal.myRights || cal.myRights.mayWrite !== false),
+    [calendars],
+  );
+
+  const [title, setTitle] = React.useState('');
+  const [calendarId, setCalendarId] = React.useState('');
+  const [due, setDue] = React.useState<Date | null>(null);
+  const [showDuePicker, setShowDuePicker] = React.useState(false);
+  const [saving, setSaving] = React.useState(false);
+
+  React.useEffect(() => {
+    if (visible && !calendarId && writableCalendars[0]) {
+      setCalendarId(writableCalendars[0].id);
+    }
+  }, [visible, calendarId, writableCalendars]);
+
+  React.useEffect(() => {
+    if (visible) {
+      Animated.parallel([
+        Animated.timing(slideY, { toValue: 0, duration: 240, easing: Easing.out(Easing.cubic), useNativeDriver: true }),
+        Animated.timing(overlayOpacity, { toValue: 1, duration: 240, useNativeDriver: true }),
+      ]).start();
+    } else {
+      Animated.parallel([
+        Animated.timing(slideY, { toValue: Dimensions.get('window').height, duration: 200, easing: Easing.in(Easing.cubic), useNativeDriver: true }),
+        Animated.timing(overlayOpacity, { toValue: 0, duration: 200, useNativeDriver: true }),
+      ]).start();
+    }
+  }, [visible, slideY, overlayOpacity]);
+
+  const sorted = React.useMemo(() => [...tasks].sort(compareTasks), [tasks]);
+
+  const handleAdd = async () => {
+    const t = title.trim();
+    if (!t || !calendarId || saving) return;
+    setSaving(true);
+    try {
+      const task: Partial<CalendarEvent> = {
+        title: t,
+        progress: 'needs-action',
+      };
+      if (due) {
+        task.due = format(due, "yyyy-MM-dd'T'HH:mm:ss");
+      }
+      await onCreate(task, calendarId);
+      setTitle('');
+      setDue(null);
+    } finally {
+      setSaving(false);
+    }
+  };
+
+  return (
+    <Modal visible={visible} transparent animationType="none" statusBarTranslucent onRequestClose={onClose}>
+      <Animated.View style={[styles.overlay, { opacity: overlayOpacity }]}>
+        <Pressable style={styles.overlayPress} onPress={onClose} />
+      </Animated.View>
+
+      <Animated.View style={[styles.sheet, { transform: [{ translateY: slideY }] }]}>
+        <SafeAreaView edges={['bottom']} style={styles.sheetSafe}>
+          <View {...dragHandlers}>
+            <View style={styles.handleHit}>
+              <View style={styles.handle} />
+            </View>
+            <View style={styles.header}>
+              <ListChecks size={20} color={c.text} />
+              <Text style={styles.headerTitle}>Tasks</Text>
+              <Pressable onPress={onClose} style={styles.closeBtn} hitSlop={8}>
+                <X size={20} color={c.textMuted} />
+              </Pressable>
+            </View>
+          </View>
+
+          <View style={styles.addRow}>
+            <TextInput
+              value={title}
+              onChangeText={setTitle}
+              placeholder="Add a task…"
+              placeholderTextColor={c.textMuted}
+              style={styles.addInput}
+              returnKeyType="done"
+              onSubmitEditing={() => { void handleAdd(); }}
+            />
+            <Pressable
+              onPress={() => setShowDuePicker(true)}
+              style={[styles.dueChip, due && styles.dueChipActive]}
+              hitSlop={6}
+            >
+              <CalendarIcon size={14} color={due ? c.primary : c.textMuted} />
+              {due && <Text style={styles.dueChipText}>{format(due, 'MMM d')}</Text>}
+            </Pressable>
+            <Pressable
+              onPress={() => { void handleAdd(); }}
+              disabled={!title.trim() || !calendarId || saving}
+              style={[styles.addBtn, (!title.trim() || saving) && styles.addBtnDisabled]}
+            >
+              <Plus size={18} color={c.primaryForeground} />
+            </Pressable>
+          </View>
+
+          {writableCalendars.length > 1 && (
+            <ScrollView
+              horizontal
+              showsHorizontalScrollIndicator={false}
+              contentContainerStyle={styles.calChips}
+            >
+              {writableCalendars.map((cal) => (
+                <Pressable
+                  key={cal.id}
+                  onPress={() => setCalendarId(cal.id)}
+                  style={[styles.calChip, cal.id === calendarId && styles.calChipActive]}
+                >
+                  <View style={[styles.calSwatch, { backgroundColor: getCalendarColor(cal) }]} />
+                  <Text style={styles.calChipText} numberOfLines={1}>{cal.name}</Text>
+                </Pressable>
+              ))}
+            </ScrollView>
+          )}
+
+          <ScrollView style={styles.list} contentContainerStyle={styles.listContent}>
+            {sorted.length === 0 ? (
+              <View style={styles.empty}>
+                <ListChecks size={32} color={c.surfaceActive} />
+                <Text style={styles.emptyText}>No tasks yet</Text>
+              </View>
+            ) : (
+              sorted.map((task) => {
+                const completed = isCompleted(task);
+                const due = dueLabel(task);
+                return (
+                  <View key={task.id} style={styles.taskRow}>
+                    <Pressable
+                      onPress={() => { void onToggle(task.id); }}
+                      style={[styles.checkbox, completed && styles.checkboxChecked]}
+                      hitSlop={8}
+                    >
+                      {completed && <Check size={14} color={c.primaryForeground} />}
+                    </Pressable>
+                    <View style={styles.taskText}>
+                      <Text style={[styles.taskTitle, completed && styles.taskTitleDone]} numberOfLines={2}>
+                        {task.title || 'Untitled task'}
+                      </Text>
+                      {due && <Text style={styles.taskDue}>{due}</Text>}
+                    </View>
+                    <Pressable onPress={() => { void onDelete(task.id); }} hitSlop={8} style={styles.taskDelete}>
+                      <Trash2 size={16} color={c.textMuted} />
+                    </Pressable>
+                  </View>
+                );
+              })
+            )}
+          </ScrollView>
+        </SafeAreaView>
+      </Animated.View>
+
+      {showDuePicker && (
+        <DateTimePicker
+          value={due ?? new Date()}
+          mode="date"
+          display={Platform.OS === 'ios' ? 'spinner' : 'default'}
+          onChange={(_, d) => {
+            setShowDuePicker(false);
+            if (d) setDue(d);
+          }}
+        />
+      )}
+    </Modal>
+  );
+}
+
+function makeStyles(c: ThemePalette) {
+  return StyleSheet.create({
+    overlay: { ...StyleSheet.absoluteFillObject, backgroundColor: 'rgba(0,0,0,0.5)' },
+    overlayPress: { flex: 1 },
+    sheet: {
+      position: 'absolute',
+      left: 0,
+      right: 0,
+      bottom: 0,
+      maxHeight: '85%',
+      backgroundColor: c.background,
+      borderTopLeftRadius: radius.xl,
+      borderTopRightRadius: radius.xl,
+      borderTopWidth: 1,
+      borderTopColor: c.border,
+    },
+    sheetSafe: { paddingTop: spacing.sm, flexShrink: 1 },
+    handleHit: { alignItems: 'center', paddingTop: spacing.xs, paddingBottom: spacing.sm },
+    handle: { width: 36, height: 4, borderRadius: 2, backgroundColor: c.surfaceActive },
+
+    header: {
+      flexDirection: 'row',
+      alignItems: 'center',
+      gap: spacing.sm,
+      paddingHorizontal: spacing.lg,
+      paddingBottom: spacing.md,
+    },
+    headerTitle: { flex: 1, ...typography.h3, color: c.text },
+    closeBtn: { padding: 4 },
+
+    addRow: {
+      flexDirection: 'row',
+      alignItems: 'center',
+      gap: spacing.sm,
+      paddingHorizontal: spacing.lg,
+      paddingBottom: spacing.sm,
+    },
+    addInput: {
+      flex: 1,
+      ...typography.body,
+      color: c.text,
+      borderWidth: 1,
+      borderColor: c.border,
+      borderRadius: radius.sm,
+      paddingHorizontal: spacing.md,
+      paddingVertical: spacing.sm,
+      backgroundColor: c.surface,
+    },
+    dueChip: {
+      flexDirection: 'row',
+      alignItems: 'center',
+      gap: 4,
+      paddingHorizontal: spacing.sm,
+      height: 38,
+      borderRadius: radius.sm,
+      borderWidth: 1,
+      borderColor: c.border,
+      backgroundColor: c.surface,
+    },
+    dueChipActive: { borderColor: c.primary, backgroundColor: c.primaryBg },
+    dueChipText: { ...typography.caption, color: c.primary },
+    addBtn: {
+      width: 38,
+      height: 38,
+      borderRadius: radius.sm,
+      backgroundColor: c.primary,
+      alignItems: 'center',
+      justifyContent: 'center',
+    },
+    addBtnDisabled: { opacity: 0.5 },
+
+    calChips: { paddingHorizontal: spacing.lg, paddingBottom: spacing.sm, gap: spacing.sm },
+    calChip: {
+      flexDirection: 'row',
+      alignItems: 'center',
+      gap: spacing.xs,
+      paddingHorizontal: spacing.sm,
+      paddingVertical: spacing.xs,
+      borderRadius: radius.full,
+      borderWidth: 1,
+      borderColor: c.border,
+      maxWidth: 160,
+    },
+    calChipActive: { borderColor: c.primary, backgroundColor: c.primaryBg },
+    calSwatch: { width: 10, height: 10, borderRadius: 5 },
+    calChipText: { ...typography.caption, color: c.text, flexShrink: 1 },
+
+    list: { flexGrow: 0 },
+    listContent: { paddingHorizontal: spacing.lg, paddingBottom: spacing.lg },
+    empty: { alignItems: 'center', paddingVertical: spacing.xxl, gap: spacing.sm },
+    emptyText: { ...typography.body, color: c.textMuted },
+
+    taskRow: {
+      flexDirection: 'row',
+      alignItems: 'center',
+      gap: spacing.md,
+      paddingVertical: spacing.sm,
+      borderBottomWidth: 1,
+      borderBottomColor: c.borderLight,
+    },
+    checkbox: {
+      width: 22,
+      height: 22,
+      borderRadius: radius.xs,
+      borderWidth: 2,
+      borderColor: c.border,
+      alignItems: 'center',
+      justifyContent: 'center',
+    },
+    checkboxChecked: { backgroundColor: c.primary, borderColor: c.primary },
+    taskText: { flex: 1 },
+    taskTitle: { ...typography.body, color: c.text },
+    taskTitleDone: { textDecorationLine: 'line-through', color: c.textMuted },
+    taskDue: { ...typography.caption, color: c.textMuted, marginTop: 2 },
+    taskDelete: { padding: 4 },
+  });
+}
diff --git a/src/components/contacts/AddressBookPickerSheet.tsx b/src/components/contacts/AddressBookPickerSheet.tsx
new file mode 100644
index 00000000..f3e0eca5
--- /dev/null
+++ b/src/components/contacts/AddressBookPickerSheet.tsx
@@ -0,0 +1,218 @@
+import React from 'react';
+import {
+  View, Text, StyleSheet, ScrollView, Pressable, Modal, Animated, Easing, TextInput, Alert,
+} from 'react-native';
+import { useSafeAreaInsets } from 'react-native-safe-area-context';
+import { BookUser, X, Check, Plus } from 'lucide-react-native';
+import { spacing, radius, typography, componentSizes, type ThemePalette } from '../../theme/tokens';
+import { useColors } from '../../theme/colors';
+import { useSheetDrag } from '../../lib/use-sheet-drag';
+import { useContactsStore } from '../../stores/contacts-store';
+
+interface Props {
+  visible: boolean;
+  onClose: () => void;
+  /** Book the contact(s) currently live in - shown with a check, not selectable. */
+  currentBookId?: string | null;
+  onPick: (addressBookId: string) => void;
+  title?: string;
+}
+
+export default function AddressBookPickerSheet({
+  visible, onClose, currentBookId, onPick, title = 'Move to address book',
+}: Props) {
+  const c = useColors();
+  const styles = React.useMemo(() => makeStyles(c), [c]);
+  const insets = useSafeAreaInsets();
+  const addressBooks = useContactsStore((s) => s.addressBooks);
+  const createAddressBook = useContactsStore((s) => s.createAddressBook);
+
+  const [creating, setCreating] = React.useState(false);
+  const [newName, setNewName] = React.useState('');
+  const [busy, setBusy] = React.useState(false);
+
+  const slideY = React.useRef(new Animated.Value(600)).current;
+  const overlayOpacity = React.useRef(new Animated.Value(0)).current;
+  const dragHandlers = useSheetDrag({ slideY, closedY: 600, onClose });
+
+  React.useEffect(() => {
+    if (visible) {
+      setCreating(false);
+      setNewName('');
+      Animated.parallel([
+        Animated.timing(slideY, { toValue: 0, duration: 220, easing: Easing.out(Easing.cubic), useNativeDriver: true }),
+        Animated.timing(overlayOpacity, { toValue: 1, duration: 220, useNativeDriver: true }),
+      ]).start();
+    } else {
+      Animated.parallel([
+        Animated.timing(slideY, { toValue: 600, duration: 180, easing: Easing.in(Easing.cubic), useNativeDriver: true }),
+        Animated.timing(overlayOpacity, { toValue: 0, duration: 180, useNativeDriver: true }),
+      ]).start();
+    }
+  }, [visible, slideY, overlayOpacity]);
+
+  const handleCreate = async () => {
+    const name = newName.trim();
+    if (!name || busy) return;
+    setBusy(true);
+    try {
+      const book = await createAddressBook(name);
+      setCreating(false);
+      setNewName('');
+      onPick(book.id);
+    } catch (err) {
+      Alert.alert('Could not create address book', err instanceof Error ? err.message : 'Unknown error');
+    } finally {
+      setBusy(false);
+    }
+  };
+
+  return (
+    <Modal visible={visible} transparent animationType="none" onRequestClose={onClose} statusBarTranslucent>
+      <Animated.View style={[styles.overlay, { opacity: overlayOpacity }]}>
+        <Pressable style={{ flex: 1 }} onPress={onClose} />
+      </Animated.View>
+      <Animated.View
+        style={[
+          styles.sheet,
+          { paddingBottom: Math.max(insets.bottom, spacing.md), transform: [{ translateY: slideY }] },
+        ]}
+      >
+        <View {...dragHandlers}>
+          <View style={styles.handleHit}>
+            <View style={styles.handle} />
+          </View>
+          <View style={styles.header}>
+            <Text style={styles.title}>{title}</Text>
+            <Pressable onPress={onClose} hitSlop={8} style={styles.close}>
+              <X size={18} color={c.textSecondary} />
+            </Pressable>
+          </View>
+        </View>
+
+        <ScrollView keyboardShouldPersistTaps="handled">
+          {addressBooks.map((book) => {
+            const isCurrent = book.id === currentBookId;
+            const canWrite = book.myRights?.mayWrite !== false;
+            const canTarget = canWrite && !isCurrent;
+            return (
+              <Pressable
+                key={book.id}
+                onPress={canTarget ? () => onPick(book.id) : undefined}
+                disabled={!canTarget}
+                style={({ pressed }) => [styles.row, pressed && canTarget && styles.rowPressed]}
+              >
+                <BookUser size={16} color={canTarget ? c.textSecondary : c.textMuted} />
+                <Text style={[styles.rowLabel, !canTarget && styles.rowLabelDisabled]} numberOfLines={1}>
+                  {book.name}
+                </Text>
+                {isCurrent && <Check size={14} color={c.textMuted} />}
+              </Pressable>
+            );
+          })}
+
+          {creating ? (
+            <View style={styles.createRow}>
+              <TextInput
+                style={styles.createInput}
+                placeholder="New address book name"
+                placeholderTextColor={c.textMuted}
+                value={newName}
+                onChangeText={setNewName}
+                autoFocus
+                returnKeyType="done"
+                onSubmitEditing={() => { void handleCreate(); }}
+              />
+              <Pressable
+                onPress={() => { void handleCreate(); }}
+                disabled={!newName.trim() || busy}
+                style={[styles.createBtn, (!newName.trim() || busy) && styles.createBtnDisabled]}
+                hitSlop={6}
+              >
+                <Check size={16} color={c.primaryForeground} />
+              </Pressable>
+            </View>
+          ) : (
+            <Pressable
+              onPress={() => setCreating(true)}
+              style={({ pressed }) => [styles.row, pressed && styles.rowPressed]}
+            >
+              <Plus size={16} color={c.primary} />
+              <Text style={[styles.rowLabel, { color: c.primary }]}>New address book…</Text>
+            </Pressable>
+          )}
+        </ScrollView>
+      </Animated.View>
+    </Modal>
+  );
+}
+
+function makeStyles(c: ThemePalette) {
+  return StyleSheet.create({
+    overlay: { ...StyleSheet.absoluteFillObject, backgroundColor: 'rgba(0,0,0,0.5)' },
+    sheet: {
+      position: 'absolute',
+      left: 0,
+      right: 0,
+      bottom: 0,
+      maxHeight: '75%',
+      backgroundColor: c.popover,
+      borderTopLeftRadius: radius.lg,
+      borderTopRightRadius: radius.lg,
+      borderTopWidth: 1,
+      borderColor: c.border,
+      paddingTop: spacing.sm,
+    },
+    handleHit: { alignItems: 'center', paddingTop: spacing.xs, paddingBottom: spacing.sm },
+    handle: { width: 36, height: 4, borderRadius: 2, backgroundColor: c.border },
+    header: {
+      flexDirection: 'row',
+      alignItems: 'center',
+      justifyContent: 'space-between',
+      paddingHorizontal: spacing.lg,
+      paddingBottom: spacing.sm,
+      borderBottomWidth: 1,
+      borderBottomColor: c.border,
+    },
+    title: { ...typography.bodySemibold, color: c.text },
+    close: { width: 28, height: 28, alignItems: 'center', justifyContent: 'center', borderRadius: radius.xs },
+    row: {
+      flexDirection: 'row',
+      alignItems: 'center',
+      gap: spacing.sm,
+      paddingHorizontal: spacing.lg,
+      paddingVertical: spacing.sm + 2,
+      minHeight: 44,
+    },
+    rowPressed: { backgroundColor: c.surfaceHover },
+    rowLabel: { ...typography.body, color: c.text, flex: 1 },
+    rowLabelDisabled: { color: c.textMuted },
+    createRow: {
+      flexDirection: 'row',
+      alignItems: 'center',
+      gap: spacing.sm,
+      paddingHorizontal: spacing.lg,
+      paddingVertical: spacing.sm,
+    },
+    createInput: {
+      flex: 1,
+      ...typography.body,
+      color: c.text,
+      height: componentSizes.inputHeight,
+      paddingHorizontal: spacing.md,
+      borderWidth: 1,
+      borderColor: c.border,
+      borderRadius: radius.sm,
+      backgroundColor: c.background,
+    },
+    createBtn: {
+      width: 36,
+      height: 36,
+      alignItems: 'center',
+      justifyContent: 'center',
+      backgroundColor: c.primary,
+      borderRadius: radius.full,
+    },
+    createBtnDisabled: { opacity: 0.4 },
+  });
+}
diff --git a/src/components/contacts/ContactImportSheet.tsx b/src/components/contacts/ContactImportSheet.tsx
new file mode 100644
index 00000000..8fadf53c
--- /dev/null
+++ b/src/components/contacts/ContactImportSheet.tsx
@@ -0,0 +1,391 @@
+import React from 'react';
+import {
+  View, Text, StyleSheet, ScrollView, Pressable, Modal, Animated, Easing, Alert, ActivityIndicator,
+} from 'react-native';
+import { SafeAreaView, useSafeAreaInsets } from 'react-native-safe-area-context';
+import * as FileSystem from 'expo-file-system/legacy';
+import { Upload, X, Check, FileText, AlertTriangle, BookUser } from 'lucide-react-native';
+import type { ContactCard } from '../../api/types';
+import { parseVCard, detectDuplicates } from '../../lib/vcard';
+import { getContactDisplayName, getContactPrimaryEmail } from '../../lib/contact-utils';
+import { useContactsStore } from '../../stores/contacts-store';
+import Button from '../Button';
+import { spacing, radius, typography, type ThemePalette } from '../../theme/tokens';
+import { useColors } from '../../theme/colors';
+
+// expo-document-picker is loaded lazily on first use; its native module is not
+// linked into every build (matches the FilesScreen upload flow).
+type DocumentPickerModule = typeof import('expo-document-picker');
+let documentPickerModule: DocumentPickerModule | null = null;
+function loadDocumentPicker(): DocumentPickerModule | null {
+  if (documentPickerModule) return documentPickerModule;
+  try {
+    documentPickerModule = require('expo-document-picker') as DocumentPickerModule;
+    return documentPickerModule;
+  } catch {
+    return null;
+  }
+}
+
+interface Props {
+  visible: boolean;
+  onClose: () => void;
+  /** Address book the imported contacts are created in. */
+  targetBookId: string | null;
+  targetBookName?: string;
+  onChangeTarget?: () => void;
+  onImported?: (count: number) => void;
+}
+
+export default function ContactImportSheet({
+  visible, onClose, targetBookId, targetBookName, onChangeTarget, onImported,
+}: Props) {
+  const c = useColors();
+  const styles = React.useMemo(() => makeStyles(c), [c]);
+  const insets = useSafeAreaInsets();
+  const existing = useContactsStore((s) => s.contacts);
+  const importContacts = useContactsStore((s) => s.importContacts);
+
+  const [parsed, setParsed] = React.useState<ContactCard[]>([]);
+  const [selected, setSelected] = React.useState<Set<number>>(new Set());
+  const [duplicates, setDuplicates] = React.useState<Map<number, string>>(new Map());
+  const [error, setError] = React.useState<string | null>(null);
+  const [importing, setImporting] = React.useState(false);
+  const [result, setResult] = React.useState<number | null>(null);
+
+  const slideY = React.useRef(new Animated.Value(900)).current;
+  const overlayOpacity = React.useRef(new Animated.Value(0)).current;
+
+  const resetState = React.useCallback(() => {
+    setParsed([]);
+    setSelected(new Set());
+    setDuplicates(new Map());
+    setError(null);
+    setImporting(false);
+    setResult(null);
+  }, []);
+
+  React.useEffect(() => {
+    if (visible) {
+      resetState();
+      Animated.parallel([
+        Animated.timing(slideY, { toValue: 0, duration: 240, easing: Easing.out(Easing.cubic), useNativeDriver: true }),
+        Animated.timing(overlayOpacity, { toValue: 1, duration: 240, useNativeDriver: true }),
+      ]).start();
+    } else {
+      Animated.parallel([
+        Animated.timing(slideY, { toValue: 900, duration: 200, easing: Easing.in(Easing.cubic), useNativeDriver: true }),
+        Animated.timing(overlayOpacity, { toValue: 0, duration: 200, useNativeDriver: true }),
+      ]).start();
+    }
+  }, [visible, slideY, overlayOpacity, resetState]);
+
+  const pickFile = async () => {
+    const picker = loadDocumentPicker();
+    if (!picker) {
+      Alert.alert(
+        'Import unavailable',
+        'The file picker is not installed in this build. Rebuild the app (expo run:android) to enable importing.',
+      );
+      return;
+    }
+    setError(null);
+    let res;
+    try {
+      res = await picker.getDocumentAsync({ copyToCacheDirectory: true, multiple: false });
+    } catch (e) {
+      setError(e instanceof Error ? e.message : 'Could not open the file picker');
+      return;
+    }
+    if (res.canceled || res.assets.length === 0) return;
+    const asset = res.assets[0];
+
+    if (asset.size && asset.size > 5 * 1024 * 1024) {
+      setError('That file is too large (max 5 MB).');
+      return;
+    }
+
+    try {
+      const text = await FileSystem.readAsStringAsync(asset.uri);
+      const contacts = parseVCard(text);
+      if (contacts.length === 0) {
+        setError('No contacts were found in that file.');
+        return;
+      }
+      const dupes = detectDuplicates(existing, contacts);
+      const initial = new Set<number>();
+      contacts.forEach((_, idx) => { if (!dupes.has(idx)) initial.add(idx); });
+      setParsed(contacts);
+      setDuplicates(dupes);
+      setSelected(initial);
+    } catch (e) {
+      setError(e instanceof Error ? e.message : 'Could not read or parse that file.');
+    }
+  };
+
+  const toggle = (idx: number) => {
+    setSelected((prev) => {
+      const next = new Set(prev);
+      if (next.has(idx)) next.delete(idx);
+      else next.add(idx);
+      return next;
+    });
+  };
+
+  const selectAll = () => setSelected(new Set(parsed.map((_, i) => i)));
+  const selectNone = () => setSelected(new Set());
+
+  const doImport = async () => {
+    if (!targetBookId) {
+      Alert.alert('No address book', 'Create an address book before importing contacts.');
+      return;
+    }
+    const toImport = parsed.filter((_, i) => selected.has(i));
+    if (toImport.length === 0) return;
+    setImporting(true);
+    try {
+      const count = await importContacts(toImport, targetBookId);
+      setResult(count);
+      onImported?.(count);
+    } catch (e) {
+      setError(e instanceof Error ? e.message : 'Import failed.');
+    } finally {
+      setImporting(false);
+    }
+  };
+
+  return (
+    <Modal visible={visible} transparent animationType="none" onRequestClose={onClose} statusBarTranslucent>
+      <Animated.View style={[styles.overlay, { opacity: overlayOpacity }]}>
+        <Pressable style={{ flex: 1 }} onPress={onClose} />
+      </Animated.View>
+      <Animated.View style={[styles.sheet, { transform: [{ translateY: slideY }] }]}>
+        <SafeAreaView edges={['bottom']} style={{ flex: 1 }}>
+          <View style={styles.header}>
+            <Text style={styles.title}>Import contacts</Text>
+            <Pressable onPress={onClose} hitSlop={8} style={styles.close}>
+              <X size={20} color={c.text} />
+            </Pressable>
+          </View>
+
+          {result !== null ? (
+            <View style={styles.center}>
+              <View style={styles.successBadge}>
+                <Check size={26} color={c.primaryForeground} />
+              </View>
+              <Text style={styles.successText}>
+                Imported {result} contact{result === 1 ? '' : 's'}.
+              </Text>
+              <Button variant="outline" size="sm" onPress={onClose}>Done</Button>
+            </View>
+          ) : parsed.length === 0 ? (
+            <View style={styles.center}>
+              <Pressable style={styles.dropZone} onPress={() => { void pickFile(); }}>
+                <Upload size={32} color={c.textMuted} />
+                <Text style={styles.dropTitle}>Choose a vCard file</Text>
+                <Text style={styles.dropHint}>.vcf / .vcard — single or multiple contacts</Text>
+              </Pressable>
+              {!!error && (
+                <View style={styles.errorBox}>
+                  <AlertTriangle size={16} color={c.error} />
+                  <Text style={styles.errorText}>{error}</Text>
+                </View>
+              )}
+            </View>
+          ) : (
+            <>
+              <Pressable
+                style={styles.targetRow}
+                onPress={onChangeTarget}
+                disabled={!onChangeTarget}
+              >
+                <BookUser size={16} color={c.textSecondary} />
+                <Text style={styles.targetText} numberOfLines={1}>
+                  Import into {targetBookName || 'address book'}
+                </Text>
+                {onChangeTarget && <Text style={styles.targetChange}>Change</Text>}
+              </Pressable>
+
+              <View style={styles.toolbar}>
+                <Text style={styles.toolbarCount}>
+                  {parsed.length} found · {selected.size} selected
+                </Text>
+                <View style={{ flexDirection: 'row', gap: spacing.md }}>
+                  <Pressable onPress={selectAll} hitSlop={6}>
+                    <Text style={styles.link}>All</Text>
+                  </Pressable>
+                  <Pressable onPress={selectNone} hitSlop={6}>
+                    <Text style={styles.link}>None</Text>
+                  </Pressable>
+                </View>
+              </View>
+
+              <ScrollView style={{ flex: 1 }}>
+                {parsed.map((contact, idx) => {
+                  const name = getContactDisplayName(contact);
+                  const email = getContactPrimaryEmail(contact);
+                  const isDupe = duplicates.has(idx);
+                  const isSelected = selected.has(idx);
+                  return (
+                    <Pressable
+                      key={idx}
+                      onPress={() => toggle(idx)}
+                      style={({ pressed }) => [styles.row, pressed && styles.rowPressed]}
+                    >
+                      <View style={[styles.checkbox, isSelected && styles.checkboxOn]}>
+                        {isSelected && <Check size={13} color={c.primaryForeground} />}
+                      </View>
+                      <FileText size={16} color={c.textMuted} />
+                      <View style={{ flex: 1, minWidth: 0 }}>
+                        <Text style={styles.rowName} numberOfLines={1}>{name || email || '—'}</Text>
+                        {!!email && !!name && (
+                          <Text style={styles.rowEmail} numberOfLines={1}>{email}</Text>
+                        )}
+                      </View>
+                      {isDupe && (
+                        <Text style={styles.dupeBadge}>Duplicate</Text>
+                      )}
+                    </Pressable>
+                  );
+                })}
+              </ScrollView>
+
+              {!!error && (
+                <View style={styles.errorBox}>
+                  <AlertTriangle size={16} color={c.error} />
+                  <Text style={styles.errorText}>{error}</Text>
+                </View>
+              )}
+
+              <View style={[styles.footer, { paddingBottom: Math.max(insets.bottom, spacing.md) }]}>
+                <Button variant="outline" onPress={onClose} disabled={importing}>Cancel</Button>
+                <Button
+                  onPress={() => { void doImport(); }}
+                  disabled={importing || selected.size === 0}
+                  icon={importing ? <ActivityIndicator size="small" color={c.primaryForeground} /> : undefined}
+                >
+                  {importing ? 'Importing…' : `Import ${selected.size}`}
+                </Button>
+              </View>
+            </>
+          )}
+        </SafeAreaView>
+      </Animated.View>
+    </Modal>
+  );
+}
+
+function makeStyles(c: ThemePalette) {
+  return StyleSheet.create({
+    overlay: { ...StyleSheet.absoluteFillObject, backgroundColor: 'rgba(0,0,0,0.5)' },
+    sheet: {
+      position: 'absolute',
+      left: 0,
+      right: 0,
+      bottom: 0,
+      height: '85%',
+      backgroundColor: c.popover,
+      borderTopLeftRadius: radius.lg,
+      borderTopRightRadius: radius.lg,
+      borderTopWidth: 1,
+      borderColor: c.border,
+    },
+    header: {
+      flexDirection: 'row',
+      alignItems: 'center',
+      justifyContent: 'space-between',
+      paddingHorizontal: spacing.lg,
+      paddingVertical: spacing.md,
+      borderBottomWidth: 1,
+      borderBottomColor: c.border,
+    },
+    title: { ...typography.h3, color: c.text },
+    close: { width: 36, height: 36, alignItems: 'center', justifyContent: 'center', borderRadius: radius.sm },
+    center: { flex: 1, alignItems: 'center', justifyContent: 'center', gap: spacing.lg, padding: spacing.xl },
+    dropZone: {
+      width: '100%',
+      borderWidth: 2,
+      borderColor: c.border,
+      borderStyle: 'dashed',
+      borderRadius: radius.lg,
+      paddingVertical: spacing.xxxl,
+      alignItems: 'center',
+      gap: spacing.sm,
+    },
+    dropTitle: { ...typography.bodyMedium, color: c.text },
+    dropHint: { ...typography.caption, color: c.textMuted },
+    successBadge: {
+      width: 56, height: 56, borderRadius: radius.full,
+      backgroundColor: c.primary, alignItems: 'center', justifyContent: 'center',
+    },
+    successText: { ...typography.bodyMedium, color: c.text },
+    targetRow: {
+      flexDirection: 'row',
+      alignItems: 'center',
+      gap: spacing.sm,
+      paddingHorizontal: spacing.lg,
+      paddingVertical: spacing.sm,
+      borderBottomWidth: 1,
+      borderBottomColor: c.borderLight,
+    },
+    targetText: { ...typography.caption, color: c.textSecondary, flex: 1 },
+    targetChange: { ...typography.captionMedium, color: c.primary },
+    toolbar: {
+      flexDirection: 'row',
+      alignItems: 'center',
+      justifyContent: 'space-between',
+      paddingHorizontal: spacing.lg,
+      paddingVertical: spacing.sm,
+    },
+    toolbarCount: { ...typography.caption, color: c.textMuted },
+    link: { ...typography.captionMedium, color: c.primary },
+    row: {
+      flexDirection: 'row',
+      alignItems: 'center',
+      gap: spacing.md,
+      paddingHorizontal: spacing.lg,
+      paddingVertical: spacing.sm + 2,
+      minHeight: 48,
+    },
+    rowPressed: { backgroundColor: c.surfaceHover },
+    checkbox: {
+      width: 20, height: 20, borderRadius: radius.xs,
+      borderWidth: 1, borderColor: c.border,
+      alignItems: 'center', justifyContent: 'center',
+    },
+    checkboxOn: { backgroundColor: c.primary, borderColor: c.primary },
+    rowName: { ...typography.body, color: c.text },
+    rowEmail: { ...typography.caption, color: c.textMuted, marginTop: 1 },
+    dupeBadge: {
+      ...typography.small,
+      color: c.warning,
+      backgroundColor: c.warningBg,
+      paddingHorizontal: 6,
+      paddingVertical: 2,
+      borderRadius: radius.xs,
+      overflow: 'hidden',
+    },
+    errorBox: {
+      flexDirection: 'row',
+      alignItems: 'center',
+      gap: spacing.sm,
+      marginHorizontal: spacing.lg,
+      marginTop: spacing.sm,
+      padding: spacing.md,
+      borderRadius: radius.sm,
+      backgroundColor: c.errorBg,
+      borderWidth: 1,
+      borderColor: c.errorBorder,
+    },
+    errorText: { ...typography.caption, color: c.errorForeground, flex: 1 },
+    footer: {
+      flexDirection: 'row',
+      justifyContent: 'flex-end',
+      gap: spacing.md,
+      paddingHorizontal: spacing.lg,
+      paddingTop: spacing.md,
+      borderTopWidth: 1,
+      borderTopColor: c.border,
+    },
+  });
+}
diff --git a/src/components/contacts/TagAssignSheet.tsx b/src/components/contacts/TagAssignSheet.tsx
new file mode 100644
index 00000000..2aadc17b
--- /dev/null
+++ b/src/components/contacts/TagAssignSheet.tsx
@@ -0,0 +1,190 @@
+import React from 'react';
+import {
+  View, Text, StyleSheet, ScrollView, Pressable, Modal, Animated, Easing, TextInput,
+} from 'react-native';
+import { useSafeAreaInsets } from 'react-native-safe-area-context';
+import { Tag, X, Plus } from 'lucide-react-native';
+import { spacing, radius, typography, componentSizes, type ThemePalette } from '../../theme/tokens';
+import { useColors } from '../../theme/colors';
+import { useSheetDrag } from '../../lib/use-sheet-drag';
+import { useContactsStore, selectKeywordsUsed } from '../../stores/contacts-store';
+
+interface Props {
+  visible: boolean;
+  onClose: () => void;
+  /** Called with the chosen tag (existing or freshly typed). */
+  onPick: (keyword: string) => void;
+  title?: string;
+}
+
+export default function TagAssignSheet({
+  visible, onClose, onPick, title = 'Add tag',
+}: Props) {
+  const c = useColors();
+  const styles = React.useMemo(() => makeStyles(c), [c]);
+  const insets = useSafeAreaInsets();
+  const keywords = useContactsStore(selectKeywordsUsed);
+
+  const [input, setInput] = React.useState('');
+
+  const slideY = React.useRef(new Animated.Value(600)).current;
+  const overlayOpacity = React.useRef(new Animated.Value(0)).current;
+  const dragHandlers = useSheetDrag({ slideY, closedY: 600, onClose });
+
+  React.useEffect(() => {
+    if (visible) {
+      setInput('');
+      Animated.parallel([
+        Animated.timing(slideY, { toValue: 0, duration: 220, easing: Easing.out(Easing.cubic), useNativeDriver: true }),
+        Animated.timing(overlayOpacity, { toValue: 1, duration: 220, useNativeDriver: true }),
+      ]).start();
+    } else {
+      Animated.parallel([
+        Animated.timing(slideY, { toValue: 600, duration: 180, easing: Easing.in(Easing.cubic), useNativeDriver: true }),
+        Animated.timing(overlayOpacity, { toValue: 0, duration: 180, useNativeDriver: true }),
+      ]).start();
+    }
+  }, [visible, slideY, overlayOpacity]);
+
+  const submitNew = () => {
+    const kw = input.trim();
+    if (!kw) return;
+    onPick(kw);
+  };
+
+  return (
+    <Modal visible={visible} transparent animationType="none" onRequestClose={onClose} statusBarTranslucent>
+      <Animated.View style={[styles.overlay, { opacity: overlayOpacity }]}>
+        <Pressable style={{ flex: 1 }} onPress={onClose} />
+      </Animated.View>
+      <Animated.View
+        style={[
+          styles.sheet,
+          { paddingBottom: Math.max(insets.bottom, spacing.md), transform: [{ translateY: slideY }] },
+        ]}
+      >
+        <View {...dragHandlers}>
+          <View style={styles.handleHit}>
+            <View style={styles.handle} />
+          </View>
+          <View style={styles.header}>
+            <Text style={styles.title}>{title}</Text>
+            <Pressable onPress={onClose} hitSlop={8} style={styles.close}>
+              <X size={18} color={c.textSecondary} />
+            </Pressable>
+          </View>
+        </View>
+
+        <View style={styles.inputRow}>
+          <TextInput
+            style={styles.input}
+            placeholder="New tag name"
+            placeholderTextColor={c.textMuted}
+            value={input}
+            onChangeText={setInput}
+            autoCapitalize="none"
+            returnKeyType="done"
+            onSubmitEditing={submitNew}
+          />
+          <Pressable
+            onPress={submitNew}
+            disabled={!input.trim()}
+            style={[styles.addBtn, !input.trim() && styles.addBtnDisabled]}
+            hitSlop={6}
+          >
+            <Plus size={16} color={c.primaryForeground} />
+          </Pressable>
+        </View>
+
+        <ScrollView keyboardShouldPersistTaps="handled">
+          {keywords.length === 0 ? (
+            <Text style={styles.empty}>No tags yet. Type one above.</Text>
+          ) : (
+            keywords.map((kw) => (
+              <Pressable
+                key={kw.keyword}
+                onPress={() => onPick(kw.keyword)}
+                style={({ pressed }) => [styles.row, pressed && styles.rowPressed]}
+              >
+                <Tag size={16} color={c.textSecondary} />
+                <Text style={styles.rowLabel} numberOfLines={1}>{kw.keyword}</Text>
+                <Text style={styles.rowCount}>{kw.count}</Text>
+              </Pressable>
+            ))
+          )}
+        </ScrollView>
+      </Animated.View>
+    </Modal>
+  );
+}
+
+function makeStyles(c: ThemePalette) {
+  return StyleSheet.create({
+    overlay: { ...StyleSheet.absoluteFillObject, backgroundColor: 'rgba(0,0,0,0.5)' },
+    sheet: {
+      position: 'absolute',
+      left: 0,
+      right: 0,
+      bottom: 0,
+      maxHeight: '75%',
+      backgroundColor: c.popover,
+      borderTopLeftRadius: radius.lg,
+      borderTopRightRadius: radius.lg,
+      borderTopWidth: 1,
+      borderColor: c.border,
+      paddingTop: spacing.sm,
+    },
+    handleHit: { alignItems: 'center', paddingTop: spacing.xs, paddingBottom: spacing.sm },
+    handle: { width: 36, height: 4, borderRadius: 2, backgroundColor: c.border },
+    header: {
+      flexDirection: 'row',
+      alignItems: 'center',
+      justifyContent: 'space-between',
+      paddingHorizontal: spacing.lg,
+      paddingBottom: spacing.sm,
+      borderBottomWidth: 1,
+      borderBottomColor: c.border,
+    },
+    title: { ...typography.bodySemibold, color: c.text },
+    close: { width: 28, height: 28, alignItems: 'center', justifyContent: 'center', borderRadius: radius.xs },
+    inputRow: {
+      flexDirection: 'row',
+      alignItems: 'center',
+      gap: spacing.sm,
+      paddingHorizontal: spacing.lg,
+      paddingVertical: spacing.sm,
+    },
+    input: {
+      flex: 1,
+      ...typography.body,
+      color: c.text,
+      height: componentSizes.inputHeight,
+      paddingHorizontal: spacing.md,
+      borderWidth: 1,
+      borderColor: c.border,
+      borderRadius: radius.sm,
+      backgroundColor: c.background,
+    },
+    addBtn: {
+      width: 36,
+      height: 36,
+      alignItems: 'center',
+      justifyContent: 'center',
+      backgroundColor: c.primary,
+      borderRadius: radius.full,
+    },
+    addBtnDisabled: { opacity: 0.4 },
+    empty: { ...typography.caption, color: c.textMuted, textAlign: 'center', paddingVertical: spacing.xl },
+    row: {
+      flexDirection: 'row',
+      alignItems: 'center',
+      gap: spacing.sm,
+      paddingHorizontal: spacing.lg,
+      paddingVertical: spacing.sm + 2,
+      minHeight: 44,
+    },
+    rowPressed: { backgroundColor: c.surfaceHover },
+    rowLabel: { ...typography.body, color: c.text, flex: 1 },
+    rowCount: { ...typography.caption, color: c.textMuted },
+  });
+}
diff --git a/src/components/contacts/index.ts b/src/components/contacts/index.ts
index 1caaea55..a61c4b4c 100644
--- a/src/components/contacts/index.ts
+++ b/src/components/contacts/index.ts
@@ -1,4 +1,7 @@
+export { default as AddressBookPickerSheet } from './AddressBookPickerSheet';
+export { default as ContactImportSheet } from './ContactImportSheet';
 export { default as ContactListRow } from './ContactListRow';
 export { default as ContactPickerSheet } from './ContactPickerSheet';
 export { default as ContactsSidebarDrawer } from './ContactsSidebarDrawer';
+export { default as TagAssignSheet } from './TagAssignSheet';
 export { default as FieldBlock, FieldRow } from './FieldBlock';
diff --git a/src/components/email/CalendarInvitationBanner.tsx b/src/components/email/CalendarInvitationBanner.tsx
new file mode 100644
index 00000000..d6eb7024
--- /dev/null
+++ b/src/components/email/CalendarInvitationBanner.tsx
@@ -0,0 +1,305 @@
+import React from 'react';
+import { View, Text, StyleSheet, Pressable, ActivityIndicator, Linking } from 'react-native';
+import {
+  CalendarPlus, Check, HelpCircle, X, MapPin, Video, Clock, CalendarDays, AlertTriangle,
+} from 'lucide-react-native';
+import { format, parseISO } from 'date-fns';
+import type { Email, CalendarEvent } from '../../api/types';
+import { spacing, radius, typography, type ThemePalette } from '../../theme/tokens';
+import { useColors } from '../../theme/colors';
+import { parseCalendarBlob } from '../../api/calendar';
+import { useCalendarStore } from '../../stores/calendar-store';
+import { useAccountStore } from '../../stores/account-store';
+import { useSettingsStore } from '../../stores/settings-store';
+import {
+  findCalendarAttachment,
+  findParticipantByEmail,
+  getOrganizerName,
+  buildReplyTo,
+  inferInvitationMethod,
+  type InvitationMethod,
+} from '../../lib/calendar-invitation';
+
+type BannerState = 'loading' | 'parsed' | 'done' | 'error';
+type RsvpStatus = 'accepted' | 'tentative' | 'declined';
+
+interface Props {
+  email: Email;
+}
+
+export function CalendarInvitationBanner({ email }: Props) {
+  const c = useColors();
+  const styles = React.useMemo(() => makeStyles(c), [c]);
+  const enabled = useSettingsStore((s) => s.calendarInvitationParsingEnabled);
+  const calendars = useCalendarStore((s) => s.calendars);
+  const importEvents = useCalendarStore((s) => s.importEvents);
+  const rsvpEvent = useCalendarStore((s) => s.rsvpEvent);
+  const activeEmail = useAccountStore((s) => s.getActiveAccount()?.email ?? null);
+
+  const attachment = React.useMemo(() => findCalendarAttachment(email), [email]);
+
+  const [state, setState] = React.useState<BannerState>('loading');
+  const [event, setEvent] = React.useState<Partial<CalendarEvent> | null>(null);
+  const [method, setMethod] = React.useState<InvitationMethod>('unknown');
+  const [rsvpStatus, setRsvpStatus] = React.useState<RsvpStatus | null>(null);
+  const [notice, setNotice] = React.useState<string | null>(null);
+  const [busy, setBusy] = React.useState(false);
+
+  React.useEffect(() => {
+    let cancelled = false;
+    if (!attachment || !enabled) return;
+    setState('loading');
+    (async () => {
+      try {
+        const events = await parseCalendarBlob(attachment.blobId);
+        if (cancelled) return;
+        if (events.length === 0) {
+          setState('error');
+          return;
+        }
+        const parsed = events[0];
+        setEvent(parsed);
+        setMethod(inferInvitationMethod(parsed));
+        setState('parsed');
+      } catch {
+        if (!cancelled) setState('error');
+      }
+    })();
+    return () => { cancelled = true; };
+  }, [attachment, enabled]);
+
+  if (!attachment || !enabled || state === 'error') return null;
+
+  if (state === 'loading') {
+    return (
+      <View style={styles.banner}>
+        <ActivityIndicator size="small" color={c.primary} />
+        <Text style={styles.loadingText}>Reading invitation…</Text>
+      </View>
+    );
+  }
+  if (!event) return null;
+
+  const startStr = event.showWithoutTime ? event.start : (event.utcStart || event.start);
+  const startDate = startStr ? parseISO(startStr) : null;
+  const dateLabel = startDate && !isNaN(startDate.getTime())
+    ? (event.showWithoutTime
+        ? format(startDate, 'EEEE, MMM d, yyyy')
+        : format(startDate, 'EEE, MMM d · HH:mm'))
+    : null;
+  const organizer = getOrganizerName(event);
+  const location = event.locations ? Object.values(event.locations)[0]?.name : undefined;
+  const videoUri = event.virtualLocations ? Object.values(event.virtualLocations)[0]?.uri : undefined;
+  const me = activeEmail ? findParticipantByEmail(event, [activeEmail]) : null;
+  const canRsvp = method !== 'cancel' && method !== 'reply' && !!me;
+
+  const writableCalendar = calendars.find((cal) => !cal.myRights || cal.myRights.mayWrite !== false);
+
+  const ensureImportedAndRsvp = async (status: RsvpStatus) => {
+    if (busy || !writableCalendar) return;
+    setBusy(true);
+    setNotice(null);
+    try {
+      // Make sure the event exists in a local calendar (dedupes by UID).
+      await importEvents([event], writableCalendar.id);
+      // Re-read from the store to get the server-assigned id + participant.
+      const stored = useCalendarStore.getState().events.find((e) => e.uid === event.uid);
+      const participant = stored && activeEmail
+        ? findParticipantByEmail(stored, [activeEmail])
+        : me;
+      if (stored && participant) {
+        await rsvpEvent(stored.id, participant.id, status, buildReplyTo(event));
+        setRsvpStatus(status);
+        setNotice('Response sent');
+      } else {
+        setNotice('Added to calendar');
+      }
+      setState('done');
+    } catch {
+      setNotice('Could not send your response');
+    } finally {
+      setBusy(false);
+    }
+  };
+
+  const handleImport = async () => {
+    if (busy || !writableCalendar) return;
+    setBusy(true);
+    setNotice(null);
+    try {
+      const count = await importEvents([event], writableCalendar.id);
+      setNotice(count > 0 ? 'Added to calendar' : 'Already in your calendar');
+      setState('done');
+    } catch {
+      setNotice('Could not add the event');
+    } finally {
+      setBusy(false);
+    }
+  };
+
+  return (
+    <View style={styles.banner}>
+      <View style={styles.headerRow}>
+        <View style={styles.iconBadge}>
+          <CalendarDays size={18} color={c.primary} />
+        </View>
+        <View style={{ flex: 1, minWidth: 0 }}>
+          <Text style={styles.title} numberOfLines={2}>{event.title || 'Calendar invitation'}</Text>
+          {method === 'cancel' && <Text style={styles.cancelled}>This event was cancelled</Text>}
+        </View>
+      </View>
+
+      {dateLabel && (
+        <Row icon={<Clock size={15} color={c.textMuted} />} text={dateLabel} styles={styles} />
+      )}
+      {location ? (
+        <Row icon={<MapPin size={15} color={c.textMuted} />} text={location} styles={styles} />
+      ) : null}
+      {videoUri ? (
+        <Pressable style={styles.detailRow} onPress={() => { void Linking.openURL(videoUri); }}>
+          <Video size={15} color={c.textMuted} />
+          <Text style={[styles.detailText, { color: c.primary }]} numberOfLines={1}>Join video call</Text>
+        </Pressable>
+      ) : null}
+      {organizer ? (
+        <Row icon={<CalendarPlus size={15} color={c.textMuted} />} text={`Organizer: ${organizer}`} styles={styles} />
+      ) : null}
+
+      {notice && <Text style={styles.notice}>{notice}</Text>}
+
+      {state !== 'done' && (
+        <View style={styles.actions}>
+          {canRsvp ? (
+            <>
+              <RsvpBtn label="Yes" active={rsvpStatus === 'accepted'} activeColor={c.success}
+                icon={<Check size={15} color={rsvpStatus === 'accepted' ? c.textInverse : c.success} />}
+                disabled={busy} onPress={() => ensureImportedAndRsvp('accepted')} c={c} styles={styles} />
+              <RsvpBtn label="Maybe" active={rsvpStatus === 'tentative'} activeColor={c.warning}
+                icon={<HelpCircle size={15} color={rsvpStatus === 'tentative' ? c.textInverse : c.warning} />}
+                disabled={busy} onPress={() => ensureImportedAndRsvp('tentative')} c={c} styles={styles} />
+              <RsvpBtn label="No" active={rsvpStatus === 'declined'} activeColor={c.error}
+                icon={<X size={15} color={rsvpStatus === 'declined' ? c.textInverse : c.error} />}
+                disabled={busy} onPress={() => ensureImportedAndRsvp('declined')} c={c} styles={styles} />
+            </>
+          ) : (
+            <Pressable
+              style={[styles.importBtn, busy && { opacity: 0.5 }]}
+              onPress={() => { void handleImport(); }}
+              disabled={busy}
+            >
+              {busy ? (
+                <ActivityIndicator size="small" color={c.primaryForeground} />
+              ) : (
+                <CalendarPlus size={16} color={c.primaryForeground} />
+              )}
+              <Text style={styles.importBtnText}>Add to calendar</Text>
+            </Pressable>
+          )}
+        </View>
+      )}
+
+      {!writableCalendar && state !== 'done' && (
+        <View style={styles.warnRow}>
+          <AlertTriangle size={14} color={c.warning} />
+          <Text style={styles.warnText}>No writable calendar available</Text>
+        </View>
+      )}
+    </View>
+  );
+}
+
+function Row({
+  icon, text, styles,
+}: {
+  icon: React.ReactNode;
+  text: string;
+  styles: ReturnType<typeof makeStyles>;
+}) {
+  return (
+    <View style={styles.detailRow}>
+      {icon}
+      <Text style={styles.detailText} numberOfLines={2}>{text}</Text>
+    </View>
+  );
+}
+
+function RsvpBtn({
+  label, icon, active, activeColor, disabled, onPress, c, styles,
+}: {
+  label: string;
+  icon: React.ReactNode;
+  active: boolean;
+  activeColor: string;
+  disabled?: boolean;
+  onPress: () => void;
+  c: ThemePalette;
+  styles: ReturnType<typeof makeStyles>;
+}) {
+  return (
+    <Pressable
+      onPress={onPress}
+      disabled={disabled}
+      style={[
+        styles.rsvpBtn,
+        active && { backgroundColor: activeColor, borderColor: activeColor },
+        disabled && { opacity: 0.5 },
+      ]}
+    >
+      {icon}
+      <Text style={[styles.rsvpBtnText, active && { color: c.textInverse }]}>{label}</Text>
+    </Pressable>
+  );
+}
+
+function makeStyles(c: ThemePalette) {
+  return StyleSheet.create({
+    banner: {
+      marginHorizontal: spacing.lg,
+      marginBottom: spacing.md,
+      padding: spacing.md,
+      borderRadius: radius.md,
+      borderWidth: 1,
+      borderColor: c.border,
+      backgroundColor: c.surface,
+      gap: spacing.xs,
+    },
+    loadingText: { ...typography.caption, color: c.textMuted },
+    headerRow: { flexDirection: 'row', alignItems: 'center', gap: spacing.sm, marginBottom: spacing.xs },
+    iconBadge: {
+      width: 32, height: 32, borderRadius: radius.sm,
+      backgroundColor: c.primaryBg, alignItems: 'center', justifyContent: 'center',
+    },
+    title: { ...typography.bodySemibold, color: c.text },
+    cancelled: { ...typography.caption, color: c.error, marginTop: 2 },
+    detailRow: { flexDirection: 'row', alignItems: 'center', gap: spacing.sm, paddingVertical: 2 },
+    detailText: { flex: 1, ...typography.caption, color: c.textSecondary },
+    notice: { ...typography.captionMedium, color: c.primary, marginTop: spacing.xs },
+    actions: { flexDirection: 'row', gap: spacing.sm, marginTop: spacing.sm },
+    rsvpBtn: {
+      flex: 1,
+      flexDirection: 'row',
+      alignItems: 'center',
+      justifyContent: 'center',
+      gap: 4,
+      paddingVertical: spacing.sm,
+      borderRadius: radius.sm,
+      borderWidth: 1,
+      borderColor: c.border,
+      backgroundColor: c.background,
+    },
+    rsvpBtnText: { ...typography.caption, color: c.text },
+    importBtn: {
+      flex: 1,
+      flexDirection: 'row',
+      alignItems: 'center',
+      justifyContent: 'center',
+      gap: spacing.sm,
+      paddingVertical: spacing.sm,
+      borderRadius: radius.sm,
+      backgroundColor: c.primary,
+    },
+    importBtnText: { ...typography.bodyMedium, color: c.primaryForeground },
+    warnRow: { flexDirection: 'row', alignItems: 'center', gap: spacing.xs, marginTop: spacing.xs },
+    warnText: { ...typography.caption, color: c.warning },
+  });
+}
diff --git a/src/components/settings/ComposingSettings.tsx b/src/components/settings/ComposingSettings.tsx
index c4f8e87c..bf422acb 100644
--- a/src/components/settings/ComposingSettings.tsx
+++ b/src/components/settings/ComposingSettings.tsx
@@ -16,6 +16,8 @@ export function ComposingSettings() {
   const setAttachmentReminderEnabled = useSettingsStore((s) => s.setAttachmentReminderEnabled);
   const attachmentReminderKeywords = useSettingsStore((s) => s.attachmentReminderKeywords);
   const setAttachmentReminderKeywords = useSettingsStore((s) => s.setAttachmentReminderKeywords);
+  const sendDelaySeconds = useSettingsStore((s) => s.sendDelaySeconds);
+  const updateSetting = useSettingsStore((s) => s.updateSetting);
   const hydrated = useSettingsStore((s) => s.hydrated);
   const hydrate = useSettingsStore((s) => s.hydrate);
 
@@ -37,6 +39,14 @@ export function ComposingSettings() {
     setAttachmentReminderKeywords(attachmentReminderKeywords.filter((k) => k !== kw));
   };
 
+  const SEND_DELAY_OPTIONS: { label: string; value: number }[] = [
+    { label: 'Off', value: 0 },
+    { label: '5s', value: 5 },
+    { label: '10s', value: 10 },
+    { label: '20s', value: 20 },
+    { label: '30s', value: 30 },
+  ];
+
   return (
     <SettingsSection
       title="Composing"
@@ -49,6 +59,29 @@ export function ComposingSettings() {
         <ToggleSwitch checked={autoSelectReplyIdentity} onChange={setAutoSelectReplyIdentity} />
       </SettingItem>
 
+      <View style={styles.subBlock}>
+        <Text style={styles.subLabel}>Undo send delay</Text>
+        <Text style={styles.subDescription}>
+          Hold outgoing mail for a few seconds so you can cancel it. Requires server support.
+        </Text>
+        <View style={styles.segmentRow}>
+          {SEND_DELAY_OPTIONS.map((opt) => {
+            const active = sendDelaySeconds === opt.value;
+            return (
+              <Pressable
+                key={opt.value}
+                onPress={() => updateSetting('sendDelaySeconds', opt.value)}
+                style={[styles.segment, active && styles.segmentActive]}
+              >
+                <Text style={[styles.segmentText, active && styles.segmentTextActive]}>
+                  {opt.label}
+                </Text>
+              </Pressable>
+            );
+          })}
+        </View>
+      </View>
+
       <SettingItem
         label="Attachment reminder"
         description="Warn before sending if the message mentions an attachment but none is attached."
@@ -110,6 +143,19 @@ function makeStyles(c: ThemePalette) {
   subBlock: { paddingVertical: spacing.md, gap: spacing.sm },
   subLabel: { ...typography.bodyMedium, color: c.text },
   subDescription: { ...typography.caption, color: c.mutedForeground },
+  segmentRow: { flexDirection: 'row', gap: 6, marginTop: 4 },
+  segment: {
+    flex: 1,
+    alignItems: 'center',
+    paddingVertical: 8,
+    borderRadius: radius.sm,
+    borderWidth: 1,
+    borderColor: c.border,
+    backgroundColor: c.background,
+  },
+  segmentActive: { backgroundColor: c.primary, borderColor: c.primary },
+  segmentText: { ...typography.caption, color: c.text },
+  segmentTextActive: { color: c.primaryForeground, fontWeight: '600' },
   chips: { flexDirection: 'row', flexWrap: 'wrap', gap: 6 },
   chip: {
     flexDirection: 'row',
diff --git a/src/components/settings/ContactsSettings.tsx b/src/components/settings/ContactsSettings.tsx
index 70f34272..f91b4e3b 100644
--- a/src/components/settings/ContactsSettings.tsx
+++ b/src/components/settings/ContactsSettings.tsx
@@ -1,30 +1,50 @@
 import React from 'react';
-import { Alert, Share, Text } from 'react-native';
+import { Alert, Share, Text, View, StyleSheet, Pressable, TextInput } from 'react-native';
 import * as FileSystem from 'expo-file-system/legacy';
 import * as Sharing from 'expo-sharing';
-import { Download } from 'lucide-react-native';
+import {
+  Download, Upload, Plus, Pencil, Trash2, Check, X, BookUser,
+} from 'lucide-react-native';
 import { SettingsSection, SettingItem, ToggleSwitch } from './settings-section';
 import Button from '../Button';
+import Dialog from '../Dialog';
+import { ContactImportSheet } from '../contacts';
 import { useSettingsStore } from '../../stores/settings-store';
-import { useContactsStore } from '../../stores/contacts-store';
+import { useContactsStore, selectAddressBooksWithCount } from '../../stores/contacts-store';
 import { contactsToVCard } from '../../lib/vcard';
 import { isGroup } from '../../lib/contact-utils';
-import { typography, type ThemePalette } from '../../theme/tokens';
+import { spacing, radius, typography, componentSizes, type ThemePalette } from '../../theme/tokens';
 import { useColors } from '../../theme/colors';
 
 export function ContactsSettings() {
   const c = useColors();
+  const styles = React.useMemo(() => makeStyles(c), [c]);
   const groupByLetter = useSettingsStore((s) => s.groupContactsByLetter);
   const setGroupByLetter = useSettingsStore((s) => s.setGroupContactsByLetter);
   const contacts = useContactsStore((s) => s.contacts);
+  const books = useContactsStore(selectAddressBooksWithCount);
+  const fetchAddressBooks = useContactsStore((s) => s.fetchAddressBooks);
+  const fetchContacts = useContactsStore((s) => s.fetchContacts);
+  const createAddressBook = useContactsStore((s) => s.createAddressBook);
+  const renameAddressBook = useContactsStore((s) => s.renameAddressBook);
+  const deleteAddressBook = useContactsStore((s) => s.deleteAddressBook);
 
   const [exporting, setExporting] = React.useState(false);
+  const [importOpen, setImportOpen] = React.useState(false);
 
-  const exportable = React.useMemo(() => contacts.filter((c) => !isGroup(c)), [contacts]);
+  const [editingId, setEditingId] = React.useState<string | null>(null);
+  const [editName, setEditName] = React.useState('');
+  const [adding, setAdding] = React.useState(false);
+  const [newName, setNewName] = React.useState('');
+  const [busy, setBusy] = React.useState(false);
+  const [deleteTarget, setDeleteTarget] = React.useState<{ id: string; name: string; count: number } | null>(null);
+
+  const exportable = React.useMemo(() => contacts.filter((cc) => !isGroup(cc)), [contacts]);
   const exportLabel =
     exportable.length === 0
       ? 'No contacts to export'
       : `Export ${exportable.length} contact${exportable.length === 1 ? '' : 's'} as a single vCard file.`;
+  const importTargetBookId = books[0]?.id ?? null;
 
   const handleExport = async () => {
     if (exportable.length === 0 || exporting) return;
@@ -50,40 +70,256 @@ export function ContactsSettings() {
     }
   };
 
+  const startRename = (id: string, name: string) => {
+    setAdding(false);
+    setEditingId(id);
+    setEditName(name);
+  };
+
+  const commitRename = async () => {
+    const name = editName.trim();
+    if (!editingId || !name || busy) { setEditingId(null); return; }
+    setBusy(true);
+    try {
+      await renameAddressBook(editingId, name);
+      setEditingId(null);
+    } catch (err) {
+      Alert.alert('Rename failed', err instanceof Error ? err.message : 'Unknown error');
+    } finally {
+      setBusy(false);
+    }
+  };
+
+  const commitCreate = async () => {
+    const name = newName.trim();
+    if (!name || busy) return;
+    setBusy(true);
+    try {
+      await createAddressBook(name);
+      setAdding(false);
+      setNewName('');
+    } catch (err) {
+      Alert.alert('Could not create address book', err instanceof Error ? err.message : 'Unknown error');
+    } finally {
+      setBusy(false);
+    }
+  };
+
+  const confirmDelete = async () => {
+    if (!deleteTarget) return;
+    const { id } = deleteTarget;
+    setDeleteTarget(null);
+    try {
+      await deleteAddressBook(id);
+    } catch (err) {
+      Alert.alert('Delete failed', err instanceof Error ? err.message : 'Unknown error');
+    }
+  };
+
   return (
-    <SettingsSection
-      title="Contacts"
-      description="Display preferences and address-book tools."
-    >
-      <SettingItem
-        label="Group by first letter"
-        description="Show alphabetical section headers in the contacts list."
+    <>
+      <SettingsSection
+        title="Contacts"
+        description="Display preferences and address-book tools."
       >
-        <ToggleSwitch checked={groupByLetter} onChange={setGroupByLetter} />
-      </SettingItem>
-
-      <SettingItem
-        label="Export contacts"
-        description={exportLabel}
-      >
-        <Button
-          variant="outline"
-          size="sm"
-          icon={<Download size={14} color={c.text} />}
-          onPress={() => { void handleExport(); }}
-          disabled={exportable.length === 0 || exporting}
-          loading={exporting}
+        <SettingItem
+          label="Group by first letter"
+          description="Show alphabetical section headers in the contacts list."
         >
-          Export
-        </Button>
-      </SettingItem>
+          <ToggleSwitch checked={groupByLetter} onChange={setGroupByLetter} />
+        </SettingItem>
 
-      <SettingItem
-        label="Import contacts"
-        description="Importing vCard files is currently available on the web client only."
+        <SettingItem
+          label="Import contacts"
+          description="Import contacts from a vCard (.vcf) file with duplicate detection."
+        >
+          <Button
+            variant="outline"
+            size="sm"
+            icon={<Upload size={14} color={c.text} />}
+            onPress={() => setImportOpen(true)}
+            disabled={books.length === 0}
+          >
+            Import
+          </Button>
+        </SettingItem>
+
+        <SettingItem
+          label="Export contacts"
+          description={exportLabel}
+        >
+          <Button
+            variant="outline"
+            size="sm"
+            icon={<Download size={14} color={c.text} />}
+            onPress={() => { void handleExport(); }}
+            disabled={exportable.length === 0 || exporting}
+            loading={exporting}
+          >
+            Export
+          </Button>
+        </SettingItem>
+      </SettingsSection>
+
+      <SettingsSection
+        title="Address books"
+        description="Create, rename, and remove the address books that organize your contacts."
       >
-        <Text style={[typography.caption, { color: c.textMuted }]}>Web only</Text>
-      </SettingItem>
-    </SettingsSection>
+        {books.map((book) => (
+          <View key={book.id} style={styles.bookRow}>
+            <BookUser size={16} color={c.textSecondary} />
+            {editingId === book.id ? (
+              <>
+                <TextInput
+                  style={styles.bookInput}
+                  value={editName}
+                  onChangeText={setEditName}
+                  autoFocus
+                  returnKeyType="done"
+                  onSubmitEditing={() => { void commitRename(); }}
+                  placeholderTextColor={c.textMuted}
+                />
+                <Pressable onPress={() => { void commitRename(); }} hitSlop={6} style={styles.iconBtn}>
+                  <Check size={16} color={c.primary} />
+                </Pressable>
+                <Pressable onPress={() => setEditingId(null)} hitSlop={6} style={styles.iconBtn}>
+                  <X size={16} color={c.textMuted} />
+                </Pressable>
+              </>
+            ) : (
+              <>
+                <View style={{ flex: 1, minWidth: 0 }}>
+                  <Text style={styles.bookName} numberOfLines={1}>{book.name}</Text>
+                  <Text style={styles.bookCount}>
+                    {book.count} contact{book.count === 1 ? '' : 's'}
+                  </Text>
+                </View>
+                {book.myRights?.mayWrite !== false && (
+                  <Pressable onPress={() => startRename(book.id, book.name)} hitSlop={6} style={styles.iconBtn}>
+                    <Pencil size={15} color={c.textSecondary} />
+                  </Pressable>
+                )}
+                {book.myRights?.mayDelete !== false && books.length > 1 && (
+                  <Pressable
+                    onPress={() => setDeleteTarget({ id: book.id, name: book.name, count: book.count })}
+                    hitSlop={6}
+                    style={styles.iconBtn}
+                  >
+                    <Trash2 size={15} color={c.error} />
+                  </Pressable>
+                )}
+              </>
+            )}
+          </View>
+        ))}
+
+        {adding ? (
+          <View style={styles.bookRow}>
+            <BookUser size={16} color={c.textSecondary} />
+            <TextInput
+              style={styles.bookInput}
+              value={newName}
+              onChangeText={setNewName}
+              placeholder="New address book name"
+              placeholderTextColor={c.textMuted}
+              autoFocus
+              returnKeyType="done"
+              onSubmitEditing={() => { void commitCreate(); }}
+            />
+            <Pressable
+              onPress={() => { void commitCreate(); }}
+              disabled={!newName.trim() || busy}
+              hitSlop={6}
+              style={styles.iconBtn}
+            >
+              <Check size={16} color={c.primary} />
+            </Pressable>
+            <Pressable onPress={() => { setAdding(false); setNewName(''); }} hitSlop={6} style={styles.iconBtn}>
+              <X size={16} color={c.textMuted} />
+            </Pressable>
+          </View>
+        ) : (
+          <Pressable
+            style={styles.addRow}
+            onPress={() => { setEditingId(null); setAdding(true); }}
+          >
+            <Plus size={16} color={c.primary} />
+            <Text style={styles.addLabel}>New address book</Text>
+          </Pressable>
+        )}
+
+        <View style={{ marginTop: spacing.sm }}>
+          <Button
+            variant="ghost"
+            size="sm"
+            onPress={() => { void fetchAddressBooks(); void fetchContacts(); }}
+          >
+            Refresh
+          </Button>
+        </View>
+      </SettingsSection>
+
+      <ContactImportSheet
+        visible={importOpen}
+        onClose={() => setImportOpen(false)}
+        targetBookId={importTargetBookId}
+        targetBookName={books[0]?.name}
+        onImported={() => { void fetchContacts(); }}
+      />
+
+      <Dialog
+        visible={deleteTarget !== null}
+        title="Delete address book"
+        message={
+          deleteTarget
+            ? `Delete "${deleteTarget.name}"?${deleteTarget.count > 0 ? ` Its ${deleteTarget.count} contact${deleteTarget.count === 1 ? '' : 's'} will be removed from this book.` : ''} This cannot be undone.`
+            : ''
+        }
+        variant="destructive"
+        confirmText="Delete"
+        onConfirm={() => { void confirmDelete(); }}
+        onCancel={() => setDeleteTarget(null)}
+      />
+    </>
   );
 }
+
+function makeStyles(c: ThemePalette) {
+  return StyleSheet.create({
+    bookRow: {
+      flexDirection: 'row',
+      alignItems: 'center',
+      gap: spacing.sm,
+      paddingVertical: spacing.sm,
+      borderBottomWidth: 1,
+      borderBottomColor: c.borderLight,
+    },
+    bookName: { ...typography.body, color: c.text },
+    bookCount: { ...typography.caption, color: c.textMuted, marginTop: 1 },
+    bookInput: {
+      flex: 1,
+      ...typography.body,
+      color: c.text,
+      height: componentSizes.inputHeight,
+      paddingHorizontal: spacing.md,
+      borderWidth: 1,
+      borderColor: c.border,
+      borderRadius: radius.sm,
+      backgroundColor: c.background,
+    },
+    iconBtn: {
+      width: 32,
+      height: 32,
+      alignItems: 'center',
+      justifyContent: 'center',
+      borderRadius: radius.sm,
+    },
+    addRow: {
+      flexDirection: 'row',
+      alignItems: 'center',
+      gap: spacing.sm,
+      paddingVertical: spacing.md,
+    },
+    addLabel: { ...typography.body, color: c.primary },
+  });
+}
diff --git a/src/lib/__tests__/calendar-alerts.test.ts b/src/lib/__tests__/calendar-alerts.test.ts
new file mode 100644
index 00000000..034609df
--- /dev/null
+++ b/src/lib/__tests__/calendar-alerts.test.ts
@@ -0,0 +1,80 @@
+import { describe, it, expect } from 'vitest';
+import {
+  offsetToMinutesBefore,
+  minutesBeforeToOffset,
+  alertsToReminders,
+  remindersToAlerts,
+  formatReminder,
+} from '../calendar-alerts';
+
+describe('calendar-alerts', () => {
+  describe('offsetToMinutesBefore', () => {
+    it('parses minute offsets', () => {
+      expect(offsetToMinutesBefore('-PT15M')).toBe(15);
+      expect(offsetToMinutesBefore('-PT30M')).toBe(30);
+    });
+    it('parses hour and day offsets', () => {
+      expect(offsetToMinutesBefore('-PT1H')).toBe(60);
+      expect(offsetToMinutesBefore('-P1D')).toBe(60 * 24);
+    });
+    it('treats PT0S as at-time (0)', () => {
+      expect(offsetToMinutesBefore('PT0S')).toBe(0);
+    });
+    it('returns negative minutesBefore for post-start offsets', () => {
+      expect(offsetToMinutesBefore('PT10M')).toBe(-10);
+    });
+    it('returns null for garbage', () => {
+      expect(offsetToMinutesBefore('nonsense')).toBeNull();
+    });
+  });
+
+  describe('minutesBeforeToOffset', () => {
+    it('round-trips through offsetToMinutesBefore', () => {
+      for (const m of [0, 5, 15, 30, 60, 120, 60 * 24, 60 * 24 * 7]) {
+        expect(offsetToMinutesBefore(minutesBeforeToOffset(m))).toBe(m);
+      }
+    });
+    it('emits PT0S at time of event', () => {
+      expect(minutesBeforeToOffset(0)).toBe('PT0S');
+    });
+  });
+
+  describe('alertsToReminders / remindersToAlerts', () => {
+    it('extracts and de-dupes reminders, sorted by lead time desc', () => {
+      const reminders = alertsToReminders({
+        a: { trigger: { '@type': 'OffsetTrigger', offset: '-PT15M' }, action: 'display' },
+        b: { trigger: { '@type': 'OffsetTrigger', offset: '-P1D' }, action: 'display' },
+        c: { trigger: { '@type': 'OffsetTrigger', offset: '-PT15M' }, action: 'display' },
+      });
+      expect(reminders).toEqual([{ minutesBefore: 60 * 24 }, { minutesBefore: 15 }]);
+    });
+
+    it('builds an alerts map from reminders', () => {
+      const alerts = remindersToAlerts([{ minutesBefore: 15 }, { minutesBefore: 0 }]);
+      expect(alerts && Object.keys(alerts)).toHaveLength(2);
+      const offsets = Object.values(alerts!).map((a) => a.trigger.offset);
+      expect(offsets).toContain('-PT15M');
+      expect(offsets).toContain('PT0S');
+    });
+
+    it('returns undefined for an empty reminder list', () => {
+      expect(remindersToAlerts([])).toBeUndefined();
+    });
+
+    it('round-trips alerts → reminders → alerts', () => {
+      const reminders = [{ minutesBefore: 60 }, { minutesBefore: 10 }];
+      const back = alertsToReminders(remindersToAlerts(reminders));
+      expect(back).toEqual([{ minutesBefore: 60 }, { minutesBefore: 10 }]);
+    });
+  });
+
+  describe('formatReminder', () => {
+    it('formats common offsets', () => {
+      expect(formatReminder(0)).toBe('At time of event');
+      expect(formatReminder(15)).toBe('15 minutes before');
+      expect(formatReminder(60)).toBe('1 hour before');
+      expect(formatReminder(60 * 24)).toBe('1 day before');
+      expect(formatReminder(60 * 24 * 7)).toBe('1 week before');
+    });
+  });
+});
diff --git a/src/lib/__tests__/vcard.test.ts b/src/lib/__tests__/vcard.test.ts
new file mode 100644
index 00000000..f64b7d04
--- /dev/null
+++ b/src/lib/__tests__/vcard.test.ts
@@ -0,0 +1,122 @@
+import { describe, it, expect } from 'vitest';
+import {
+  parseVCard,
+  generateVCard,
+  contactToVCard,
+  detectDuplicates,
+} from '../vcard';
+import type { ContactCard } from '../../api/types';
+
+describe('parseVCard', () => {
+  it('parses a basic 3.0 card with name, email, and phone', () => {
+    const vcf = [
+      'BEGIN:VCARD',
+      'VERSION:3.0',
+      'FN:Jane Doe',
+      'N:Doe;Jane;;;',
+      'EMAIL;TYPE=WORK:jane@example.com',
+      'TEL;TYPE=CELL:+1-555-0100',
+      'END:VCARD',
+    ].join('\r\n');
+
+    const [card] = parseVCard(vcf);
+    expect(card).toBeTruthy();
+    const emails = Object.values(card.emails ?? {});
+    expect(emails[0].address).toBe('jane@example.com');
+    expect(emails[0].contexts).toEqual({ work: true });
+    const phones = Object.values(card.phones ?? {});
+    expect(phones[0].number).toBe('+1-555-0100');
+    expect(phones[0].features).toEqual({ cell: true });
+    const given = card.name?.components?.find((c) => c.kind === 'given')?.value;
+    const surname = card.name?.components?.find((c) => c.kind === 'surname')?.value;
+    expect(given).toBe('Jane');
+    expect(surname).toBe('Doe');
+  });
+
+  it('parses multiple cards in one file', () => {
+    const vcf = [
+      'BEGIN:VCARD', 'VERSION:3.0', 'FN:A', 'EMAIL:a@x.com', 'END:VCARD',
+      'BEGIN:VCARD', 'VERSION:3.0', 'FN:B', 'EMAIL:b@x.com', 'END:VCARD',
+    ].join('\r\n');
+    expect(parseVCard(vcf)).toHaveLength(2);
+  });
+
+  it('unfolds folded lines and decodes escaped values', () => {
+    const vcf = [
+      'BEGIN:VCARD',
+      'VERSION:3.0',
+      'FN:Long Name',
+      'NOTE:line one\\nline two\\, still going',
+      'END:VCARD',
+    ].join('\r\n');
+    const [card] = parseVCard(vcf);
+    const note = Object.values(card.notes ?? {})[0]?.note;
+    expect(note).toBe('line one\nline two, still going');
+  });
+
+  it('parses CATEGORIES into keywords', () => {
+    const vcf = 'BEGIN:VCARD\r\nVERSION:3.0\r\nFN:Tagged\r\nEMAIL:t@x.com\r\nCATEGORIES:Friends,VIP\r\nEND:VCARD';
+    const [card] = parseVCard(vcf);
+    expect(card.keywords).toEqual({ Friends: true, VIP: true });
+  });
+
+  it('skips cards with neither a name nor an email', () => {
+    const vcf = 'BEGIN:VCARD\r\nVERSION:3.0\r\nNOTE:orphan\r\nEND:VCARD';
+    expect(parseVCard(vcf)).toHaveLength(0);
+  });
+
+  it('strips mailto:/tel: URI schemes', () => {
+    const vcf = 'BEGIN:VCARD\r\nVERSION:4.0\r\nFN:U\r\nEMAIL:mailto:u@x.com\r\nTEL:tel:+15550111\r\nEND:VCARD';
+    const [card] = parseVCard(vcf);
+    expect(Object.values(card.emails ?? {})[0].address).toBe('u@x.com');
+    expect(Object.values(card.phones ?? {})[0].number).toBe('+15550111');
+  });
+});
+
+describe('generateVCard', () => {
+  it('round-trips name and email through parse → generate → parse', () => {
+    const original = 'BEGIN:VCARD\r\nVERSION:3.0\r\nFN:Jane Doe\r\nN:Doe;Jane;;;\r\nEMAIL;TYPE=WORK:jane@example.com\r\nEND:VCARD';
+    const [parsed] = parseVCard(original);
+    const generated = generateVCard([parsed]);
+    expect(generated).toContain('FN:Jane Doe');
+    expect(generated).toContain('EMAIL;TYPE=WORK:jane@example.com');
+
+    const [reparsed] = parseVCard(generated);
+    expect(Object.values(reparsed.emails ?? {})[0].address).toBe('jane@example.com');
+  });
+
+  it('contactToVCard emits a single BEGIN/END block', () => {
+    const card: ContactCard = {
+      id: 'c1',
+      addressBookIds: {},
+      name: { full: 'Solo', components: [{ kind: 'given', value: 'Solo' }] },
+      emails: { e0: { address: 'solo@x.com' } },
+    };
+    const out = contactToVCard(card);
+    expect(out.match(/BEGIN:VCARD/g)).toHaveLength(1);
+    expect(out.match(/END:VCARD/g)).toHaveLength(1);
+  });
+});
+
+describe('detectDuplicates', () => {
+  const existing: ContactCard[] = [
+    { id: 'x1', addressBookIds: {}, emails: { e0: { address: 'dupe@x.com' } } },
+  ];
+
+  it('flags an incoming contact that shares an email (case-insensitive)', () => {
+    const incoming: ContactCard[] = [
+      { id: 'i0', addressBookIds: {}, emails: { e0: { address: 'fresh@x.com' } } },
+      { id: 'i1', addressBookIds: {}, emails: { e0: { address: 'DUPE@x.com' } } },
+    ];
+    const dupes = detectDuplicates(existing, incoming);
+    expect(dupes.has(0)).toBe(false);
+    expect(dupes.get(1)).toBe('x1');
+  });
+
+  it('returns an empty map when nothing overlaps', () => {
+    const incoming: ContactCard[] = [
+      { id: 'i0', addressBookIds: {}, emails: { e0: { address: 'new@x.com' } } },
+    ];
+    expect(detectDuplicates(existing, incoming).size).toBe(0);
+  });
+});
diff --git a/src/lib/birthday-calendar.ts b/src/lib/birthday-calendar.ts
new file mode 100644
index 00000000..f4363ee9
--- /dev/null
+++ b/src/lib/birthday-calendar.ts
@@ -0,0 +1,117 @@
+import { eachYearOfInterval, parseISO } from 'date-fns';
+import type { Calendar, CalendarEvent, ContactCard, AnniversaryDate } from '../api/types';
+import { getContactDisplayName } from './contact-utils';
+
+export const BIRTHDAY_CALENDAR_ID = '__birthday-calendar__';
+export const BIRTHDAY_CALENDAR_COLOR = '#eab308'; // yellow
+
+// A read-only virtual calendar holding generated birthday events.
+export function createBirthdayCalendar(name = 'Birthdays'): Calendar {
+  return {
+    id: BIRTHDAY_CALENDAR_ID,
+    name,
+    color: BIRTHDAY_CALENDAR_COLOR,
+    sortOrder: 999,
+    isSubscribed: true,
+    isVisible: true,
+    isDefault: false,
+    myRights: {
+      mayReadItems: true,
+      mayWriteAll: false,
+      mayWriteOwn: false,
+      mayWrite: false,
+      mayDelete: false,
+      mayRSVP: false,
+    },
+  };
+}
+
+function parseBirthdayDate(date: AnniversaryDate): { month: number; day: number; year?: number } | null {
+  if (typeof date === 'string') {
+    if (date.startsWith('--')) {
+      const m = date.match(/^--(\d{2})-(\d{2})$/);
+      return m ? { month: parseInt(m[1], 10), day: parseInt(m[2], 10) } : null;
+    }
+    const parsed = parseISO(date);
+    if (!isNaN(parsed.getTime())) {
+      return { month: parsed.getMonth() + 1, day: parsed.getDate(), year: parsed.getFullYear() };
+    }
+    return null;
+  }
+  if ('utc' in date && date['@type'] === 'Timestamp') {
+    const parsed = parseISO(date.utc);
+    if (!isNaN(parsed.getTime())) {
+      return { month: parsed.getMonth() + 1, day: parsed.getDate(), year: parsed.getFullYear() };
+    }
+    return null;
+  }
+  // PartialDate
+  if (date.month && date.day) {
+    return { month: date.month, day: date.day, year: date.year || undefined };
+  }
+  return null;
+}
+
+// Generate virtual all-day birthday events for the given range from contacts
+// that carry a `birth` anniversary.
+export function generateBirthdayEvents(
+  contacts: ContactCard[],
+  rangeStart: string,
+  rangeEnd: string,
+): CalendarEvent[] {
+  const events: CalendarEvent[] = [];
+  const start = parseISO(rangeStart);
+  const end = parseISO(rangeEnd);
+  if (isNaN(start.getTime()) || isNaN(end.getTime())) return events;
+
+  const years = eachYearOfInterval({ start, end });
+  const endYear = end.getFullYear();
+  if (!years.some((y) => y.getFullYear() === endYear)) {
+    years.push(new Date(endYear, 0, 1));
+  }
+
+  for (const contact of contacts) {
+    if (!contact.anniversaries) continue;
+    for (const [key, anniversary] of Object.entries(contact.anniversaries)) {
+      if (anniversary.kind !== 'birth') continue;
+      const parsed = parseBirthdayDate(anniversary.date);
+      if (!parsed) continue;
+      const displayName = getContactDisplayName(contact);
+      if (!displayName) continue;
+
+      for (const yearDate of years) {
+        const year = yearDate.getFullYear();
+        // Feb 29 in a non-leap year: clamp to Feb 28.
+        let occMonth = parsed.month;
+        let occDay = parsed.day;
+        const occurrence = new Date(year, occMonth - 1, occDay);
+        if (occurrence.getMonth() !== occMonth - 1) {
+          occurrence.setDate(0);
+          occMonth = occurrence.getMonth() + 1;
+          occDay = occurrence.getDate();
+        }
+        if (occurrence < start || occurrence > end) continue;
+
+        const mm = String(occMonth).padStart(2, '0');
+        const dd = String(occDay).padStart(2, '0');
+        const age = parsed.year ? year - parsed.year : undefined;
+        const ageText = age && age > 0 ? ` (${age})` : '';
+
+        events.push({
+          id: `birthday-${contact.id}-${key}-${year}`,
+          '@type': 'Event',
+          uid: `birthday-${contact.id}-${key}`,
+          calendarIds: { [BIRTHDAY_CALENDAR_ID]: true },
+          title: `🎂 ${displayName}${ageText}`,
+          start: `${year}-${mm}-${dd}T00:00:00`,
+          duration: 'P1D',
+          showWithoutTime: true,
+          status: 'confirmed',
+          freeBusyStatus: 'free',
+          color: BIRTHDAY_CALENDAR_COLOR,
+        });
+      }
+    }
+  }
+  return events;
+}
diff --git a/src/lib/calendar-alerts.ts b/src/lib/calendar-alerts.ts
new file mode 100644
index 00000000..0226009b
--- /dev/null
+++ b/src/lib/calendar-alerts.ts
@@ -0,0 +1,103 @@
+import type { Alert, CalendarEvent } from '../api/types';
+
+// A reminder, expressed as "minutes before the event start". 0 means "at the
+// time of the event". Negative values (reminder *after* start) are preserved
+// on round-trip but the picker only offers non-negative presets.
+export interface Reminder {
+  /** Minutes before start. 0 = at time of event. */
+  minutesBefore: number;
+}
+
+const DURATION_RE = /^(-?)P(?:(\d+)W)?(?:(\d+)D)?(?:T(?:(\d+)H)?(?:(\d+)M)?(?:(\d+)S)?)?$/;
+
+// Parse an ISO 8601 duration offset ("-PT15M", "-P1D", "PT0S") to minutes.
+// Positive return value = minutes *before* the anchor (JSCalendar offsets for
+// reminders are negative, e.g. "-PT15M" fires 15 min before start).
+export function offsetToMinutesBefore(offset: string | undefined): number | null {
+  if (!offset) return null;
+  const m = DURATION_RE.exec(offset);
+  if (!m) return null;
+  const negative = m[1] === '-';
+  const weeks = parseInt(m[2] || '0', 10);
+  const days = parseInt(m[3] || '0', 10);
+  const hours = parseInt(m[4] || '0', 10);
+  const minutes = parseInt(m[5] || '0', 10);
+  const seconds = parseInt(m[6] || '0', 10);
+  const totalMinutes = weeks * 7 * 24 * 60 + days * 24 * 60 + hours * 60 + minutes + Math.round(seconds / 60);
+  // A negative offset (fires before start) is a positive "minutesBefore".
+  // `|| 0` collapses -0 to 0 so callers get a clean "at time of event".
+  return (negative ? totalMinutes : -totalMinutes) || 0;
+}
+
+export function minutesBeforeToOffset(minutesBefore: number): string {
+  if (minutesBefore === 0) return 'PT0S';
+  const sign = minutesBefore > 0 ? '-' : '';
+  let mins = Math.abs(minutesBefore);
+  const days = Math.floor(mins / (24 * 60));
+  mins -= days * 24 * 60;
+  const hours = Math.floor(mins / 60);
+  mins -= hours * 60;
+  let out = 'P';
+  if (days > 0) out += `${days}D`;
+  if (hours > 0 || mins > 0) {
+    out += 'T';
+    if (hours > 0) out += `${hours}H`;
+    if (mins > 0) out += `${mins}M`;
+  }
+  if (out === 'P') out = 'PT0M';
+  return `${sign}${out}`;
+}
+
+// Pull the list of reminders out of an event's `alerts` map. Only display-style
+// offset alerts relative to start are surfaced in the editor; anything exotic is
+// dropped from the UI list (but the event keeps it until the user saves).
+export function alertsToReminders(alerts: CalendarEvent['alerts']): Reminder[] {
+  if (!alerts) return [];
+  const out: Reminder[] = [];
+  for (const alert of Object.values(alerts)) {
+    const trigger = alert?.trigger;
+    if (!trigger) continue;
+    if (trigger.offset === undefined) continue; // skip AbsoluteTriggers in the picker
+    const minutesBefore = offsetToMinutesBefore(trigger.offset);
+    if (minutesBefore === null) continue;
+    out.push({ minutesBefore });
+  }
+  // De-dupe + sort soonest-to-event last (largest lead time first).
+  const seen = new Set<number>();
+  return out
+    .filter((r) => (seen.has(r.minutesBefore) ? false : (seen.add(r.minutesBefore), true)))
+    .sort((a, b) => b.minutesBefore - a.minutesBefore);
+}
+
+export function remindersToAlerts(reminders: Reminder[]): Record<string, Alert> | undefined {
+  if (reminders.length === 0) return undefined;
+  const alerts: Record<string, Alert> = {};
+  reminders.forEach((r, i) => {
+    alerts[`reminder-${i + 1}`] = {
+      trigger: { '@type': 'OffsetTrigger', offset: minutesBeforeToOffset(r.minutesBefore) },
+      action: 'display',
+    };
+  });
+  return alerts;
+}
+
+export function formatReminder(minutesBefore: number): string {
+  if (minutesBefore === 0) return 'At time of event';
+  if (minutesBefore < 0) return `${Math.abs(minutesBefore)} minutes after`;
+  if (minutesBefore < 60) return `${minutesBefore} minute${minutesBefore === 1 ? '' : 's'} before`;
+  if (minutesBefore < 60 * 24) {
+    const h = minutesBefore / 60;
+    return Number.isInteger(h) ? `${h} hour${h === 1 ? '' : 's'} before` : `${minutesBefore} minutes before`;
+  }
+  if (minutesBefore < 60 * 24 * 7) {
+    const d = minutesBefore / (60 * 24);
+    return Number.isInteger(d) ? `${d} day${d === 1 ? '' : 's'} before` : `${(minutesBefore / 60).toFixed(0)} hours before`;
+  }
+  const w = minutesBefore / (60 * 24 * 7);
+  return Number.isInteger(w) ? `${w} week${w === 1 ? '' : 's'} before` : `${(minutesBefore / (60 * 24)).toFixed(0)} days before`;
+}
+
+// Presets offered by the reminder picker (minutes before start).
+export const REMINDER_PRESETS: number[] = [
+  0, 5, 10, 15, 30, 60, 120, 60 * 24, 60 * 24 * 2, 60 * 24 * 7,
+];
diff --git a/src/lib/calendar-invitation.ts b/src/lib/calendar-invitation.ts
new file mode 100644
index 00000000..c0b4a8ce
--- /dev/null
+++ b/src/lib/calendar-invitation.ts
@@ -0,0 +1,148 @@
+import type { CalendarEvent, Participant, Email, Attachment } from '../api/types';
+
+// ─── Address helpers ─────────────────────────────────────
+
+export function normalizeEmail(value?: string | null): string | null {
+  if (!value) return null;
+  const normalized = value.trim().replace(/^mailto:/i, '').toLowerCase();
+  return normalized || null;
+}
+
+export function getParticipantEmail(p: Participant): string | null {
+  const direct = normalizeEmail(p.email);
+  if (direct) return direct;
+  if (p.calendarAddress) {
+    const addr = normalizeEmail(p.calendarAddress);
+    if (addr) return addr;
+  }
+  if (p.sendTo) {
+    for (const addr of Object.values(p.sendTo)) {
+      const n = normalizeEmail(addr);
+      if (n) return n;
+    }
+  }
+  return null;
+}
+
+export function isOrganizerParticipant(p: Participant): boolean {
+  return Boolean(p.roles?.owner || p.roles?.chair);
+}
+
+export function getOrganizerEmail(event: Partial<CalendarEvent>): string | null {
+  if (event.participants) {
+    for (const p of Object.values(event.participants)) {
+      if (isOrganizerParticipant(p)) {
+        const e = getParticipantEmail(p);
+        if (e) return e;
+      }
+    }
+  }
+  if (event.organizerCalendarAddress) return normalizeEmail(event.organizerCalendarAddress);
+  return null;
+}
+
+export function getOrganizerName(event: Partial<CalendarEvent>): string | null {
+  if (event.participants) {
+    for (const p of Object.values(event.participants)) {
+      if (isOrganizerParticipant(p)) return p.name || getParticipantEmail(p);
+    }
+    if (event.organizerCalendarAddress) {
+      for (const p of Object.values(event.participants)) {
+        if (p.calendarAddress === event.organizerCalendarAddress) return p.name || getParticipantEmail(p);
+      }
+    }
+  }
+  return getOrganizerEmail(event);
+}
+
+// Find the participant entry that matches one of the given user emails.
+export function findParticipantByEmail(
+  event: Partial<CalendarEvent>,
+  emails: string[],
+): { id: string; participant: Participant } | null {
+  if (!event.participants || emails.length === 0) return null;
+  const wanted = new Set(emails.map((e) => e.toLowerCase()).filter(Boolean));
+  for (const [id, p] of Object.entries(event.participants)) {
+    const e = getParticipantEmail(p);
+    if (e && wanted.has(e)) return { id, participant: p };
+  }
+  return null;
+}
+
+// `replyTo` to attach to an RSVP so the server knows where to deliver the iTIP
+// reply (Stalwart exposes the organizer as organizerCalendarAddress).
+export function buildReplyTo(event: Partial<CalendarEvent>): Record<string, string> | null {
+  if (event.replyTo) return event.replyTo;
+  if (event.organizerCalendarAddress) {
+    const addr = event.organizerCalendarAddress.startsWith('mailto:')
+      ? event.organizerCalendarAddress
+      : `mailto:${event.organizerCalendarAddress}`;
+    return { imip: addr };
+  }
+  return null;
+}
+
+// ─── iMIP method detection ───────────────────────────────
+
+export type InvitationMethod =
+  | 'publish' | 'request' | 'reply' | 'add'
+  | 'cancel' | 'refresh' | 'counter' | 'declinecounter' | 'unknown';
+
+const KNOWN_METHODS = new Set<InvitationMethod>([
+  'publish', 'request', 'reply', 'add', 'cancel', 'refresh', 'counter', 'declinecounter',
+]);
+
+function normalizeMethod(value?: string | null): InvitationMethod {
+  if (!value) return 'unknown';
+  const v = value.trim().toLowerCase();
+  return KNOWN_METHODS.has(v as InvitationMethod) ? (v as InvitationMethod) : 'unknown';
+}
+
+// JMAP strips Content-Type params (RFC 8621), so `text/calendar; method=REQUEST`
+// arrives as `text/calendar`. The raw ICS METHOD line is the reliable source.
+export function extractMethodFromRawIcs(rawText: string): InvitationMethod {
+  const m = rawText.match(/^METHOD:(\S+)/m);
+  return m ? normalizeMethod(m[1]) : 'unknown';
+}
+
+function looksLikeReply(event: Partial<CalendarEvent>): boolean {
+  if (!event.participants) return false;
+  return Object.values(event.participants).some(
+    (p) =>
+      p.roles?.attendee &&
+      !isOrganizerParticipant(p) &&
+      (p.participationStatus !== 'needs-action' || !!p.participationComment),
+  );
+}
+
+export function inferInvitationMethod(event: Partial<CalendarEvent>): InvitationMethod {
+  if (event.status === 'cancelled') return 'cancel';
+  if (looksLikeReply(event)) return 'reply';
+  if (event.participants && Object.keys(event.participants).length > 0) {
+    if (Object.values(event.participants).some(isOrganizerParticipant) || event.organizerCalendarAddress) {
+      return 'request';
+    }
+  }
+  return 'unknown';
+}
+
+// ─── Calendar attachment detection ───────────────────────
+
+const CAL_MIME = new Set(['text/calendar', 'application/ics', 'application/icalendar']);
+
+function isCalendarType(type?: string | null): boolean {
+  if (!type) return false;
+  const base = type.split(';')[0].trim().toLowerCase();
+  return CAL_MIME.has(base);
+}
+
+export function findCalendarAttachment(email: Pick<Email, 'attachments'>): Attachment | null {
+  if (!email.attachments) return null;
+  for (const att of email.attachments) {
+    const name = att.name?.toLowerCase() || '';
+    if (isCalendarType(att.type) || name.endsWith('.ics') || name.endsWith('.ical')) {
+      return att;
+    }
+  }
+  return null;
+}
diff --git a/src/lib/uuid.ts b/src/lib/uuid.ts
new file mode 100644
index 00000000..d0ce302d
--- /dev/null
+++ b/src/lib/uuid.ts
@@ -0,0 +1,20 @@
+// RFC 4122 v4 UUID generator. Prefers the platform crypto.randomUUID when
+// available (Hermes/React Native 0.81 exposes it), falling back to a
+// Math.random implementation. These IDs are only used as temporary client-side
+// keys (e.g. parsed-vCard import rows) before the server assigns real ids, so
+// the Math.random fallback's weaker entropy is acceptable.
+export function generateUUID(): string {
+  const c = (globalThis as { crypto?: { randomUUID?: () => string } }).crypto;
+  if (c?.randomUUID) {
+    try {
+      return c.randomUUID();
+    } catch {
+      // fall through to the manual implementation
+    }
+  }
+  return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, (ch) => {
+    const r = (Math.random() * 16) | 0;
+    const v = ch === 'x' ? r : (r & 0x3) | 0x8;
+    return v.toString(16);
+  });
+}
diff --git a/src/lib/vcard.ts b/src/lib/vcard.ts
index a3584e26..ffd7ada0 100644
--- a/src/lib/vcard.ts
+++ b/src/lib/vcard.ts
@@ -1,174 +1,1261 @@
 import type {
   ContactCard,
-  ContactAnniversary,
+  NameComponent,
+  ContactOnlineService,
   AnniversaryDate,
   PartialDate,
-  Timestamp,
 } from '../api/types';
-import {
-  getContactDisplayName,
-  getContactKeywords,
-} from './contact-utils';
+import { generateUUID } from './uuid';
 
-function escape(value: string): string {
-  return value
-    .replace(/\\/g, '\\\\')
-    .replace(/\n/g, '\\n')
-    .replace(/\r/g, '')
-    .replace(/,/g, '\\,')
-    .replace(/;/g, '\\;');
-}
-
-function fold(line: string): string {
-  if (line.length <= 75) return line;
-  const chunks: string[] = [];
-  let i = 0;
-  while (i < line.length) {
-    const chunk = line.slice(i, i + (i === 0 ? 75 : 74));
-    chunks.push(chunk);
-    i += chunk.length;
-  }
-  return chunks.join('\r\n ');
-}
-
-function contextsToTypeParam(contexts?: Record<string, boolean>): string {
-  if (!contexts) return '';
-  const types = Object.keys(contexts).filter((k) => contexts[k]);
-  if (types.length === 0) return '';
-  return `;TYPE=${types.join(',')}`;
-}
-
-function anniversaryDateToVCardDate(date: AnniversaryDate | undefined): string {
-  if (!date) return '';
+// Convert RFC 9553 AnniversaryDate (PartialDate|Timestamp|string) to vCard date string
+function anniversaryDateToVcardString(date: AnniversaryDate): string {
   if (typeof date === 'string') return date;
-  const ts = date as Timestamp;
-  if (ts['@type'] === 'Timestamp' && typeof ts.utc === 'string') return ts.utc;
-  const pd = date as PartialDate;
-  const y = pd.year ? String(pd.year).padStart(4, '0') : '';
-  const m = pd.month ? String(pd.month).padStart(2, '0') : '';
-  const d = pd.day ? String(pd.day).padStart(2, '0') : '';
-  if (!y && !m && !d) return '';
-  return `${y || '--'}${m || '--'}${d || '--'}`.replace(/^--/, '--');
-}
-
-function findBirthday(contact: ContactCard): ContactAnniversary | undefined {
-  if (!contact.anniversaries) return undefined;
-  return Object.values(contact.anniversaries).find((a) => a.kind === 'birth');
-}
-
-export function contactToVCard(contact: ContactCard): string {
-  const lines: string[] = [];
-  lines.push('BEGIN:VCARD');
-  lines.push('VERSION:3.0');
-
-  const displayName = getContactDisplayName(contact) || 'Unnamed';
-  lines.push(fold(`FN:${escape(displayName)}`));
-
-  const name = contact.name;
-  if (name?.components && name.components.length > 0) {
-    const parts: Record<string, string> = {
-      surname: '',
-      given: '',
-      middle: '',
-      prefix: '',
-      suffix: '',
-    };
-    for (const c of name.components) {
-      if (c.kind in parts) parts[c.kind] = c.value;
+  if (date && typeof date === 'object') {
+    if ('@type' in date && date['@type'] === 'Timestamp' && 'utc' in date) {
+      return (date as { utc: string }).utc.split('T')[0];
     }
-    lines.push(fold(
-      `N:${escape(parts.surname)};${escape(parts.given)};${escape(parts.middle)};${escape(parts.prefix)};${escape(parts.suffix)}`,
-    ));
-  } else if (name?.full) {
-    lines.push(fold(`N:;${escape(name.full)};;;`));
+    const pd = date as PartialDate;
+    if (pd.year && pd.month && pd.day) {
+      return `${String(pd.year).padStart(4, '0')}-${String(pd.month).padStart(2, '0')}-${String(pd.day).padStart(2, '0')}`;
+    }
+    if (pd.month && pd.day) {
+      return `--${String(pd.month).padStart(2, '0')}-${String(pd.day).padStart(2, '0')}`;
+    }
+    if (pd.year && pd.month) {
+      return `${String(pd.year).padStart(4, '0')}-${String(pd.month).padStart(2, '0')}`;
+    }
+    if (pd.year) return String(pd.year);
+  }
+  return String(date);
+}
+
+const VCARD_SEX_TO_GENDER: Record<string, string> = {
+  M: 'masculine',
+  F: 'feminine',
+  O: 'other',
+  N: 'none',
+  U: 'unknown',
+};
+
+const GENDER_TO_VCARD_SEX: Record<string, string> = {
+  masculine: 'M',
+  feminine: 'F',
+  other: 'O',
+  none: 'N',
+  unknown: 'U',
+};
+
+function vcardSexToGrammaticalGender(sex: string): string {
+  return VCARD_SEX_TO_GENDER[sex.toUpperCase()] || sex.toLowerCase();
+}
+
+function grammaticalGenderToVcardSex(gender: string): string {
+  return GENDER_TO_VCARD_SEX[gender.toLowerCase()] || '';
+}
+
+function unfoldLines(vcf: string): string {
+  // Normalize line endings first, then unfold continuation lines (RFC 6350 §3.2).
+  // Continuation lines start with a single SPACE or TAB; we must handle both
+  // CRLF (RFC-canonical) and LF-only files (common from Unix exporters).
+  return vcf
+    .replace(/\r\n/g, '\n')
+    .replace(/\r/g, '\n')
+    .replace(/\n[ \t]/g, '');
+}
+
+// RFC 6868 parameter value encoding - used inside parameter values only.
+// Caret-encoded sequences: ^n → LF, ^^ → ^, ^' → DQUOTE.
+function decodeParamValue(s: string): string {
+  let out = '';
+  for (let i = 0; i < s.length; i++) {
+    if (s[i] === '^' && i + 1 < s.length) {
+      const next = s[i + 1];
+      if (next === 'n') { out += '\n'; i++; continue; }
+      if (next === '^') { out += '^'; i++; continue; }
+      if (next === "'") { out += '"'; i++; continue; }
+    }
+    out += s[i];
+  }
+  return out;
+}
+
+// Split on delim, respecting DQUOTE-quoted spans (RFC 6350 §3.3 / §5).
+function splitRespectingQuotes(s: string, delim: string): string[] {
+  const out: string[] = [];
+  let buf = '';
+  let inQuote = false;
+  for (let i = 0; i < s.length; i++) {
+    const ch = s[i];
+    if (ch === '"') {
+      inQuote = !inQuote;
+      buf += ch;
+      continue;
+    }
+    if (ch === delim && !inQuote) {
+      out.push(buf);
+      buf = '';
+      continue;
+    }
+    buf += ch;
+  }
+  out.push(buf);
+  return out;
+}
+
+// Find the first ":" outside of a DQUOTE-quoted parameter value.
+// Returns -1 when none. Needed because property params may carry quoted
+// values that contain colons (e.g. ADR;LABEL="Suite 100:..." or X- params).
+function findValueColon(line: string): number {
+  let inQuote = false;
+  for (let i = 0; i < line.length; i++) {
+    const ch = line[i];
+    if (ch === '"') { inQuote = !inQuote; continue; }
+    if (ch === ':' && !inQuote) return i;
+  }
+  return -1;
+}
+
+// vCard properties may carry a group prefix: "item1.EMAIL:foo@bar".
+// Strip the prefix and return the bare property name + params component.
+function stripGroupPrefix(keyPart: string): string {
+  const dot = keyPart.indexOf('.');
+  if (dot < 0) return keyPart;
+  const before = keyPart.substring(0, dot);
+  // Only treat as group if the segment before the dot has no ";" (which would
+  // indicate it's actually a param boundary) and matches the RFC 6350 group
+  // grammar (ALPHA / DIGIT / "-").
+  if (before.includes(';')) return keyPart;
+  if (!/^[A-Za-z0-9-]+$/.test(before)) return keyPart;
+  return keyPart.substring(dot + 1);
+}
+
+// Strip URI scheme prefix from a value (e.g. "tel:+1-555" → "+1-555").
+function stripUriScheme(val: string, scheme: string): string {
+  const prefix = `${scheme}:`;
+  if (val.toLowerCase().startsWith(prefix)) return val.substring(prefix.length);
+  return val;
+}
+
+function parsePrefParam(params: Record<string, string>): number | undefined {
+  if (params.PREF) {
+    const n = parseInt(params.PREF, 10);
+    if (!Number.isNaN(n)) return n;
+  }
+  // vCard 3.0 style: TYPE=PREF (no numeric value)
+  if (params.TYPE && /\bPREF\b/i.test(params.TYPE)) return 1;
+  return undefined;
+}
+
+// vCard 2.1 quoted-printable soft line breaks: a line ending in `=` continues
+// onto the next line. This is distinct from RFC 5545/6350 line folding (which
+// uses leading whitespace and is already handled in unfoldLines). Only merge
+// when the originating line declares ENCODING=QUOTED-PRINTABLE so we don't
+// accidentally splice unrelated lines.
+function joinQpSoftBreaks(lines: string[]): string[] {
+  const result: string[] = [];
+  let i = 0;
+  while (i < lines.length) {
+    let line = lines[i];
+    if (/;ENCODING=QUOTED-PRINTABLE/i.test(line)) {
+      while (line.endsWith('=') && i + 1 < lines.length) {
+        i++;
+        line = line.slice(0, -1) + lines[i];
+      }
+    }
+    result.push(line);
+    i++;
+  }
+  return result;
+}
+
+// Decode a UTF-8 byte array to a string. Uses the platform TextDecoder when
+// present (faster, charset-aware) and otherwise falls back to a manual UTF-8
+// decode so this works under Hermes without a TextDecoder polyfill.
+function decodeBytes(bytes: number[], charset?: string): string {
+  const Decoder = (globalThis as { TextDecoder?: typeof TextDecoder }).TextDecoder;
+  if (Decoder) {
+    try {
+      return new Decoder(charset || 'utf-8').decode(new Uint8Array(bytes));
+    } catch {
+      try {
+        return new Decoder('utf-8').decode(new Uint8Array(bytes));
+      } catch {
+        // fall through to manual decode
+      }
+    }
+  }
+  // Minimal UTF-8 decoder fallback.
+  let out = '';
+  let i = 0;
+  while (i < bytes.length) {
+    const b0 = bytes[i];
+    if (b0 < 0x80) {
+      out += String.fromCharCode(b0);
+      i += 1;
+    } else if (b0 >= 0xc0 && b0 < 0xe0 && i + 1 < bytes.length) {
+      out += String.fromCharCode(((b0 & 0x1f) << 6) | (bytes[i + 1] & 0x3f));
+      i += 2;
+    } else if (b0 >= 0xe0 && b0 < 0xf0 && i + 2 < bytes.length) {
+      out += String.fromCharCode(
+        ((b0 & 0x0f) << 12) | ((bytes[i + 1] & 0x3f) << 6) | (bytes[i + 2] & 0x3f),
+      );
+      i += 3;
+    } else if (b0 >= 0xf0 && i + 3 < bytes.length) {
+      const cp = ((b0 & 0x07) << 18) | ((bytes[i + 1] & 0x3f) << 12)
+        | ((bytes[i + 2] & 0x3f) << 6) | (bytes[i + 3] & 0x3f);
+      const off = cp - 0x10000;
+      out += String.fromCharCode(0xd800 + (off >> 10), 0xdc00 + (off & 0x3ff));
+      i += 4;
+    } else {
+      out += String.fromCharCode(b0);
+      i += 1;
+    }
+  }
+  return out;
+}
+
+function decodeQuotedPrintable(input: string, charset?: string): string {
+  const cleaned = input.replace(/=\r?\n/g, '');
+  const bytes: number[] = [];
+  let i = 0;
+  while (i < cleaned.length) {
+    const ch = cleaned[i];
+    if (ch === '=' && i + 2 < cleaned.length) {
+      const hex = cleaned.substring(i + 1, i + 3);
+      if (/^[0-9A-Fa-f]{2}$/.test(hex)) {
+        bytes.push(parseInt(hex, 16));
+        i += 3;
+        continue;
+      }
+    }
+    bytes.push(cleaned.charCodeAt(i) & 0xff);
+    i += 1;
+  }
+  return decodeBytes(bytes, charset);
+}
+
+function decodeValue(raw: string): string {
+  return raw
+    .replace(/\\n/gi, '\n')
+    .replace(/\\,/g, ',')
+    .replace(/\\;/g, ';')
+    .replace(/\\\\/g, '\\');
+}
+
+function encodeValue(val: string): string {
+  return val
+    .replace(/\\/g, '\\\\')
+    .replace(/;/g, '\\;')
+    .replace(/,/g, '\\,')
+    .replace(/\n/g, '\\n');
+}
+
+function parseParams(paramStr: string): Record<string, string> {
+  const params: Record<string, string> = {};
+  if (!paramStr) return params;
+  const parts = splitRespectingQuotes(paramStr, ';');
+  for (const part of parts) {
+    if (!part) continue;
+    const eq = part.indexOf('=');
+    if (eq > 0) {
+      const name = part.substring(0, eq).toUpperCase();
+      const rawVal = part.substring(eq + 1).replace(/^"(.*)"$/, '$1');
+      params[name] = decodeParamValue(rawVal);
+    } else {
+      const upper = part.toUpperCase();
+      if (upper === 'QUOTED-PRINTABLE' || upper === 'BASE64') {
+        params.ENCODING = upper;
+      } else if (['WORK', 'HOME', 'CELL', 'FAX', 'VOICE', 'PREF', 'PAGER', 'VIDEO', 'TEXT', 'TEXTPHONE'].includes(upper)) {
+        params.TYPE = params.TYPE ? `${params.TYPE},${upper}` : upper;
+      }
+    }
+  }
+  return params;
+}
+
+const PHONE_FEATURE_TYPES = new Set(['CELL', 'FAX', 'VOICE', 'PAGER', 'VIDEO', 'TEXT', 'TEXTPHONE']);
+
+function typeToPhoneFeatures(typeStr: string | undefined): Record<string, boolean> | undefined {
+  if (!typeStr) return undefined;
+  const types = typeStr.toUpperCase().split(',');
+  const features: Record<string, boolean> = {};
+  for (const t of types) {
+    if (PHONE_FEATURE_TYPES.has(t)) {
+      features[t.toLowerCase()] = true;
+    }
+  }
+  return Object.keys(features).length > 0 ? features : undefined;
+}
+
+function typeToContext(typeStr: string | undefined): Record<string, boolean> | undefined {
+  if (!typeStr) return undefined;
+  const types = typeStr.toUpperCase().split(',');
+  const ctx: Record<string, boolean> = {};
+  if (types.includes('WORK')) ctx.work = true;
+  if (types.includes('HOME')) ctx.private = true;
+  if (!ctx.work && !ctx.private) return undefined;
+  return ctx;
+}
+
+function contextToType(contexts: Record<string, boolean> | undefined): string {
+  if (!contexts) return '';
+  if (contexts.work) return 'WORK';
+  if (contexts.private) return 'HOME';
+  return '';
+}
+
+export function parseVCard(vcfString: string): ContactCard[] {
+  const text = unfoldLines(vcfString);
+  const lines = joinQpSoftBreaks(text.split('\n'));
+  const contacts: ContactCard[] = [];
+  let current: Record<string, string[]> | null = null;
+
+  for (const line of lines) {
+    const trimmed = line.trim();
+    if (!trimmed) continue;
+
+    if (trimmed.toUpperCase() === 'BEGIN:VCARD') {
+      current = {};
+      continue;
+    }
+
+    if (trimmed.toUpperCase() === 'END:VCARD') {
+      if (current) {
+        const card = buildContact(current);
+        if (card) contacts.push(card);
+      }
+      current = null;
+      continue;
+    }
+
+    if (current) {
+      const colonIdx = findValueColon(trimmed);
+      if (colonIdx < 1) continue;
+      const keyPart = stripGroupPrefix(trimmed.substring(0, colonIdx));
+      const value = trimmed.substring(colonIdx + 1);
+      if (!current[keyPart]) current[keyPart] = [];
+      current[keyPart].push(value);
+    }
+  }
+
+  return contacts;
+}
+
+function buildContact(raw: Record<string, string[]>): ContactCard | null {
+  const id = `import-${generateUUID()}`;
+  const card: ContactCard = { id, addressBookIds: {} };
+  // Deferred BIRTHPLACE/DEATHPLACE values - attach to anniversary at end,
+  // because the BDAY/DEATHDATE entry may appear in any order.
+  let birthPlace: string | undefined;
+  let deathPlace: string | undefined;
+
+  for (const [fullKey, values] of Object.entries(raw)) {
+    // splitRespectingQuotes so a quoted param value containing ";" survives.
+    const segments = splitRespectingQuotes(fullKey, ';');
+    const propName = (segments.shift() || '').toUpperCase();
+    const paramStr = segments.join(';');
+    const params = parseParams(paramStr);
+    const pref = parsePrefParam(params);
+
+    const isQuotedPrintable = params.ENCODING?.toUpperCase() === 'QUOTED-PRINTABLE';
+
+    for (const rawValue of values) {
+      const decoded = isQuotedPrintable
+        ? decodeQuotedPrintable(rawValue, params.CHARSET)
+        : rawValue;
+      const val = decodeValue(decoded);
+
+      switch (propName) {
+        case 'FN':
+          if (!card.name) {
+            const parts = val.split(' ');
+            const components: NameComponent[] = [];
+            if (parts.length >= 2) {
+              components.push({ kind: 'given', value: parts[0] });
+              components.push({ kind: 'surname', value: parts.slice(1).join(' ') });
+            } else if (parts.length === 1) {
+              components.push({ kind: 'given', value: parts[0] });
+            }
+            card.name = { components, isOrdered: true };
+          }
+          break;
+
+        case 'N': {
+          // vCard N: family;given;additional;prefix;suffix  (RFC 6350 §6.2.2)
+          // Mapped to JSContact-standard kinds (RFC 9553 §2.2.1):
+          //   prefix→title, additional→given2, suffix→generation.
+          // Pushed in natural display order so `isOrdered: true` renders correctly.
+          const nParts = val.split(';');
+          const components: NameComponent[] = [];
+          if (nParts[3]) components.push({ kind: 'title', value: nParts[3] });
+          if (nParts[1]) components.push({ kind: 'given', value: nParts[1] });
+          if (nParts[2]) components.push({ kind: 'given2', value: nParts[2] });
+          if (nParts[0]) components.push({ kind: 'surname', value: nParts[0] });
+          if (nParts[4]) components.push({ kind: 'generation', value: nParts[4] });
+          if (components.length > 0) {
+            card.name = { components, isOrdered: true };
+          }
+          break;
+        }
+
+        case 'EMAIL': {
+          if (!card.emails) card.emails = {};
+          const idx = Object.keys(card.emails).length;
+          card.emails[`e${idx}`] = {
+            address: stripUriScheme(val, 'mailto'),
+            contexts: typeToContext(params.TYPE),
+            label: params['X-ABLABEL'] || undefined,
+            pref,
+          };
+          break;
+        }
+
+        case 'TEL': {
+          if (!card.phones) card.phones = {};
+          const idx = Object.keys(card.phones).length;
+          card.phones[`p${idx}`] = {
+            // vCard 4.0 TEL is a URI value (RFC 6350 §6.4.1); strip the
+            // "tel:" scheme for storage as a bare number.
+            number: stripUriScheme(val, 'tel'),
+            contexts: typeToContext(params.TYPE),
+            features: typeToPhoneFeatures(params.TYPE),
+            label: params['X-ABLABEL'] || undefined,
+            pref,
+          };
+          break;
+        }
+
+        case 'ORG': {
+          if (!card.organizations) card.organizations = {};
+          const orgParts = val.split(';').filter(Boolean);
+          const idx = Object.keys(card.organizations).length;
+          card.organizations[`o${idx}`] = {
+            name: orgParts[0],
+            units: orgParts.slice(1).map((u) => ({ name: u })),
+          };
+          break;
+        }
+
+        case 'ADR': {
+          if (!card.addresses) card.addresses = {};
+          const adrParts = val.split(';');
+          const idx = Object.keys(card.addresses).length;
+          card.addresses[`a${idx}`] = {
+            street: adrParts[2] || undefined,
+            locality: adrParts[3] || undefined,
+            region: adrParts[4] || undefined,
+            postcode: adrParts[5] || undefined,
+            country: adrParts[6] || undefined,
+            // vCard 4.0 (RFC 9554 §3.2): CC param carries ISO country code,
+            // and LABEL/GEO/TZ params attach directly to the ADR.
+            countryCode: params.CC || undefined,
+            fullAddress: params.LABEL || undefined,
+            coordinates: params.GEO ? stripUriScheme(params.GEO, 'geo') : undefined,
+            timeZone: params.TZ || undefined,
+            contexts: typeToContext(params.TYPE),
+            label: params['X-ABLABEL'] || undefined,
+            pref,
+          };
+          break;
+        }
+
+        case 'NOTE': {
+          if (!card.notes) card.notes = {};
+          const idx = Object.keys(card.notes).length;
+          card.notes[`n${idx}`] = { note: val };
+          break;
+        }
+
+        case 'NICKNAME': {
+          if (!card.nicknames) card.nicknames = {};
+          card.nicknames.n0 = { name: val };
+          break;
+        }
+
+        case 'UID':
+          card.uid = val;
+          break;
+
+        case 'KIND': {
+          // RFC 6350 §6.1.4 plus RFC 6473 (application).
+          const k = val.toLowerCase();
+          if (k === 'group' || k === 'individual' || k === 'org'
+              || k === 'location' || k === 'device' || k === 'application') {
+            card.kind = k;
+          }
+          break;
+        }
+
+        case 'MEMBER': {
+          if (!card.members) card.members = {};
+          const memberUri = val.startsWith('urn:uuid:') ? val.substring(9) : val;
+          card.members[memberUri] = true;
+          break;
+        }
+
+        case 'PHOTO': {
+          if (!card.media) card.media = {};
+          const idx = Object.keys(card.media).length;
+          const encoding = params.ENCODING?.toUpperCase();
+          // vCard 4.0 uses MEDIATYPE; 3.0 reuses TYPE for the image kind.
+          const mediaType = params.MEDIATYPE || (params.TYPE && params.TYPE.includes('/') ? params.TYPE : (params.TYPE && /^(JPEG|JPG|PNG|GIF|WEBP|HEIC|BMP|SVG)$/i.test(params.TYPE) ? params.TYPE : '')) || '';
+          if (encoding === 'B' || encoding === 'BASE64') {
+            // Inline base64 photo - construct a data URI
+            const mime = mediaType.includes('/') ? mediaType : mediaType ? `image/${mediaType.toLowerCase()}` : 'image/jpeg';
+            card.media[`m${idx}`] = {
+              kind: 'photo',
+              uri: `data:${mime};base64,${rawValue}`,
+              mediaType: mime,
+            };
+          } else if (val.startsWith('data:') || val.startsWith('http://') || val.startsWith('https://')) {
+            // vCard 4.0 URI value (data URI or URL) - no ENCODING param.
+            card.media[`m${idx}`] = {
+              kind: 'photo',
+              uri: val,
+              mediaType: mediaType.includes('/') ? mediaType : undefined,
+            };
+          }
+          break;
+        }
+
+        case 'TITLE': {
+          if (!card.titles) card.titles = {};
+          const idx = Object.keys(card.titles).length;
+          card.titles[`t${idx}`] = { name: val, kind: 'title' };
+          break;
+        }
+
+        case 'ROLE': {
+          if (!card.titles) card.titles = {};
+          const idx = Object.keys(card.titles).length;
+          card.titles[`t${idx}`] = { name: val, kind: 'role' };
+          break;
+        }
+
+        case 'URL': {
+          if (!card.onlineServices) card.onlineServices = {};
+          const idx = Object.keys(card.onlineServices).length;
+          card.onlineServices[`u${idx}`] = {
+            uri: val,
+            contexts: typeToContext(params.TYPE),
+            label: params['X-ABLABEL']
+              || (params.TYPE?.toLowerCase() === 'home' || params.TYPE?.toLowerCase() === 'work' ? undefined : params.TYPE),
+            pref,
+          };
+          break;
+        }
+
+        case 'IMPP':
+        case 'X-SOCIALPROFILE':
+        case 'SOCIALPROFILE': {
+          // RFC 9554 §3.7 introduces SOCIALPROFILE; treat the same as IMPP/X-SOCIALPROFILE.
+          if (!card.onlineServices) card.onlineServices = {};
+          const idx = Object.keys(card.onlineServices).length;
+          const svc: ContactOnlineService = {
+            uri: val,
+            contexts: typeToContext(params.TYPE),
+            pref,
+          };
+          if (params['X-SERVICE-TYPE']) {
+            svc.service = params['X-SERVICE-TYPE'];
+          } else if (params.SERVICE) {
+            svc.service = params.SERVICE;
+          } else if ((propName === 'X-SOCIALPROFILE' || propName === 'SOCIALPROFILE') && params.TYPE) {
+            const typeVal = params.TYPE.toLowerCase();
+            if (typeVal !== 'work' && typeVal !== 'home') {
+              svc.service = params.TYPE;
+            }
+          }
+          if (params['X-USER']) svc.user = params['X-USER'];
+          if (params['X-ABLABEL']) svc.label = params['X-ABLABEL'];
+          card.onlineServices[`u${idx}`] = svc;
+          break;
+        }
+
+        case 'BDAY': {
+          if (!card.anniversaries) card.anniversaries = {};
+          card.anniversaries.a0 = { kind: 'birth', date: val };
+          break;
+        }
+
+        case 'BIRTHPLACE': {
+          // RFC 6474 §2.1. Stash the location and attach to the birth
+          // anniversary at the end of buildContact, since BDAY may appear
+          // either before or after BIRTHPLACE in the vCard.
+          birthPlace = val;
+          break;
+        }
+
+        case 'ANNIVERSARY':
+        case 'X-ANNIVERSARY': {
+          if (!card.anniversaries) card.anniversaries = {};
+          const idx = Object.keys(card.anniversaries).length;
+          card.anniversaries[`a${idx}`] = { kind: 'wedding', date: val };
+          break;
+        }
+
+        case 'DEATHDATE':
+        case 'X-DEATHDATE': {
+          if (!card.anniversaries) card.anniversaries = {};
+          const idx = Object.keys(card.anniversaries).length;
+          card.anniversaries[`a${idx}`] = { kind: 'death', date: val };
+          break;
+        }
+
+        case 'DEATHPLACE': {
+          // RFC 6474 §2.2.
+          deathPlace = val;
+          break;
+        }
+
+        case 'CATEGORIES': {
+          if (!card.keywords) card.keywords = {};
+          const cats = val.split(',').map((cat) => cat.trim()).filter(Boolean);
+          for (const cat of cats) {
+            card.keywords[cat] = true;
+          }
+          break;
+        }
+
+        case 'KEY': {
+          if (!card.cryptoKeys) card.cryptoKeys = {};
+          const idx = Object.keys(card.cryptoKeys).length;
+          card.cryptoKeys[`k${idx}`] = {
+            uri: val,
+            mediaType: params.MEDIATYPE || (params.TYPE && params.TYPE.includes('/') ? params.TYPE : undefined),
+            contexts: typeToContext(params.TYPE),
+          };
+          break;
+        }
+
+        case 'RELATED': {
+          if (!card.relatedTo) card.relatedTo = {};
+          // RFC 6350 §6.6.6: TYPE may be a comma-separated list (or
+          // multi-valued via repeated params); convert to relation map.
+          const relation: Record<string, boolean> = {};
+          if (params.TYPE) {
+            for (const t of params.TYPE.split(',')) {
+              const norm = t.trim().toLowerCase();
+              if (norm) relation[norm] = true;
+            }
+          }
+          card.relatedTo[val] = { relation: Object.keys(relation).length > 0 ? relation : undefined };
+          break;
+        }
+
+        case 'LANG': {
+          if (!card.preferredLanguages) card.preferredLanguages = {};
+          const idx = Object.keys(card.preferredLanguages).length;
+          card.preferredLanguages[`l${idx}`] = {
+            language: val,
+            contexts: typeToContext(params.TYPE),
+            pref,
+          };
+          break;
+        }
+
+        case 'PRODID':
+          card.prodId = val;
+          break;
+
+        case 'REV':
+          card.updated = val;
+          break;
+
+        case 'GEO': {
+          // Store GEO as coordinates on the first address, or create one
+          if (!card.addresses) card.addresses = {};
+          if (Object.keys(card.addresses).length === 0) {
+            card.addresses.a0 = { coordinates: val };
+          } else {
+            const firstKey = Object.keys(card.addresses)[0];
+            card.addresses[firstKey].coordinates = val;
+          }
+          break;
+        }
+
+        case 'TZ': {
+          if (!card.addresses) card.addresses = {};
+          if (Object.keys(card.addresses).length === 0) {
+            card.addresses.a0 = { timeZone: val };
+          } else {
+            const firstKey = Object.keys(card.addresses)[0];
+            card.addresses[firstKey].timeZone = val;
+          }
+          break;
+        }
+
+        case 'GENDER': {
+          // vCard 4.0 §6.2.7: sex-component[;identity-component]. We map the
+          // sex letter to JSContact's grammaticalGender and stuff the free-
+          // form identity into pronouns (a coarse approximation; RFC 9554's
+          // PRONOUNS / GRAMGENDER, handled below, are preferred when present).
+          const gParts = val.split(';');
+          const sexCode = gParts[0]?.toUpperCase();
+          const identityText = gParts[1];
+          if (sexCode || identityText) {
+            if (!card.speakToAs) card.speakToAs = {};
+            if (sexCode) {
+              card.speakToAs.grammaticalGender = vcardSexToGrammaticalGender(sexCode);
+            }
+            if (identityText) {
+              if (!card.speakToAs.pronouns) card.speakToAs.pronouns = {};
+              const pkey = `p${Object.keys(card.speakToAs.pronouns).length}`;
+              card.speakToAs.pronouns[pkey] = { pronouns: identityText };
+            }
+          }
+          break;
+        }
+
+        case 'LOGO': {
+          if (!card.media) card.media = {};
+          const idx = Object.keys(card.media).length;
+          const encoding = params.ENCODING?.toUpperCase();
+          // Prefer MEDIATYPE (vCard 4.0); fall back to TYPE only when it's a
+          // MIME type or a known image format token (vCard 3.0 idiom).
+          const mediaType = params.MEDIATYPE || (params.TYPE && (params.TYPE.includes('/') || /^(JPEG|JPG|PNG|GIF|WEBP|SVG)$/i.test(params.TYPE)) ? params.TYPE : '');
+          if (encoding === 'B' || encoding === 'BASE64') {
+            const mime = mediaType.includes('/') ? mediaType : mediaType ? `image/${mediaType.toLowerCase()}` : 'image/png';
+            card.media[`m${idx}`] = {
+              kind: 'logo',
+              uri: `data:${mime};base64,${rawValue}`,
+              mediaType: mime,
+            };
+          } else if (val.startsWith('data:') || val.startsWith('http://') || val.startsWith('https://')) {
+            card.media[`m${idx}`] = {
+              kind: 'logo',
+              uri: val,
+              mediaType: mediaType.includes('/') ? mediaType : undefined,
+            };
+          }
+          break;
+        }
+
+        case 'SOUND': {
+          if (!card.media) card.media = {};
+          const idx = Object.keys(card.media).length;
+          const encoding = params.ENCODING?.toUpperCase();
+          const mediaType = params.MEDIATYPE || (params.TYPE && (params.TYPE.includes('/') || /^(OGG|MP3|WAV|AAC|FLAC)$/i.test(params.TYPE)) ? params.TYPE : '');
+          if (encoding === 'B' || encoding === 'BASE64') {
+            const mime = mediaType.includes('/') ? mediaType : mediaType ? `audio/${mediaType.toLowerCase()}` : 'audio/ogg';
+            card.media[`m${idx}`] = {
+              kind: 'sound',
+              uri: `data:${mime};base64,${rawValue}`,
+              mediaType: mime,
+            };
+          } else if (val.startsWith('data:') || val.startsWith('http://') || val.startsWith('https://')) {
+            card.media[`m${idx}`] = {
+              kind: 'sound',
+              uri: val,
+              mediaType: mediaType.includes('/') ? mediaType : undefined,
+            };
+          }
+          break;
+        }
+
+        case 'LABEL': {
+          // Mailing label (v2.1/3.0) - store as fullAddress on last/new address
+          if (!card.addresses) card.addresses = {};
+          const addrKeys = Object.keys(card.addresses);
+          if (addrKeys.length > 0) {
+            const lastKey = addrKeys[addrKeys.length - 1];
+            card.addresses[lastKey].fullAddress = val;
+          } else {
+            card.addresses.a0 = { fullAddress: val, contexts: typeToContext(params.TYPE) };
+          }
+          break;
+        }
+
+        case 'CALURI':
+          card.calendarUri = val;
+          break;
+
+        case 'CALADRURI':
+          card.schedulingUri = val;
+          break;
+
+        case 'FBURL':
+          card.freeBusyUri = val;
+          break;
+
+        case 'SOURCE':
+          card.source = val;
+          break;
+
+        // ---- RFC 6715 (EXPERTISE / HOBBY / INTEREST / ORG-DIRECTORY) ----
+        case 'EXPERTISE':
+        case 'HOBBY':
+        case 'INTEREST': {
+          if (!card.personalInfo) card.personalInfo = {};
+          const idx = Object.keys(card.personalInfo).length;
+          const kind = propName.toLowerCase() as 'expertise' | 'hobby' | 'interest';
+          const rawLevel = params.LEVEL?.toLowerCase();
+          // RFC 6715 levels: expertise uses beginner/average/expert; hobby/
+          // interest use high/medium/low. Normalize all into JSContact's
+          // high/medium/low triplet.
+          const levelMap: Record<string, 'high' | 'medium' | 'low'> = {
+            beginner: 'low', average: 'medium', expert: 'high',
+            low: 'low', medium: 'medium', high: 'high',
+          };
+          const level = rawLevel ? levelMap[rawLevel] : undefined;
+          card.personalInfo[`i${idx}`] = { kind, value: val, level };
+          break;
+        }
+
+        case 'ORG-DIRECTORY': {
+          // RFC 6715 §2.4 - directory URI for the contact's organization.
+          if (!card.directories) card.directories = {};
+          const idx = Object.keys(card.directories).length;
+          card.directories[`d${idx}`] = {
+            uri: val,
+            kind: 'directory',
+            mediaType: params.MEDIATYPE || undefined,
+          };
+          break;
+        }
+
+        // ---- RFC 8605 (CONTACT-URI) ----
+        case 'CONTACT-URI': {
+          if (!card.links) card.links = {};
+          const idx = Object.keys(card.links).length;
+          card.links[`l${idx}`] = {
+            uri: val,
+            kind: 'contact',
+            pref,
+          };
+          break;
+        }
+
+        // ---- RFC 9554 vCard 4.0 extensions ----
+        case 'CREATED':
+          card.created = val;
+          break;
+
+        case 'GRAMGENDER': {
+          // RFC 9554 §3.4 - grammatical gender (animate/common/feminine/masculine/neuter).
+          if (!card.speakToAs) card.speakToAs = {};
+          card.speakToAs.grammaticalGender = val.toLowerCase();
+          break;
+        }
+
+        case 'PRONOUNS': {
+          // RFC 9554 §3.5 - free-form pronouns. May appear multiple times.
+          if (!card.speakToAs) card.speakToAs = {};
+          if (!card.speakToAs.pronouns) card.speakToAs.pronouns = {};
+          const pkey = `p${Object.keys(card.speakToAs.pronouns).length}`;
+          card.speakToAs.pronouns[pkey] = {
+            pronouns: val,
+            pref,
+            contexts: typeToContext(params.TYPE),
+          };
+          break;
+        }
+
+        // Silently swallow purely structural / sync metadata properties so
+        // they don't appear in any catch-all default.
+        case 'VERSION':
+        case 'XML':
+        case 'CLIENTPIDMAP':
+        case 'X-ABLABEL':
+          break;
+
+        default:
+          break;
+      }
+    }
+  }
+
+  // Attach BIRTHPLACE/DEATHPLACE to the matching anniversary, creating an
+  // anniversary entry if no BDAY/DEATHDATE was present.
+  if (birthPlace || deathPlace) {
+    if (!card.anniversaries) card.anniversaries = {};
+    if (birthPlace) {
+      let birth = Object.values(card.anniversaries).find((a) => a.kind === 'birth');
+      if (!birth) {
+        card.anniversaries.a0 = { kind: 'birth', date: '' };
+        birth = card.anniversaries.a0;
+      }
+      birth.place = { fullAddress: birthPlace };
+    }
+    if (deathPlace) {
+      let death = Object.values(card.anniversaries).find((a) => a.kind === 'death');
+      if (!death) {
+        const key = `a${Object.keys(card.anniversaries).length}`;
+        card.anniversaries[key] = { kind: 'death', date: '' };
+        death = card.anniversaries[key];
+      }
+      death.place = { fullAddress: deathPlace };
+    }
+  }
+
+  const hasName = (card.name && (card.name.components?.length ?? 0) > 0) || !!card.name?.full;
+  const hasEmail = card.emails && Object.keys(card.emails).length > 0;
+  if (!hasName && !hasEmail && card.kind !== 'group') return null;
+
+  return card;
+}
+
+export function generateVCard(contacts: ContactCard[]): string {
+  return contacts.map(generateSingleVCard).join('\r\n');
+}
+
+function generateSingleVCard(contact: ContactCard): string {
+  const lines: string[] = ['BEGIN:VCARD', 'VERSION:3.0'];
+
+  if (contact.uid) {
+    lines.push(`UID:${contact.uid}`);
+  }
+
+  if (contact.prodId) {
+    lines.push(`PRODID:${contact.prodId}`);
+  }
+
+  if (contact.kind) {
+    lines.push(`KIND:${contact.kind}`);
+  }
+
+  if (contact.updated) {
+    lines.push(`REV:${contact.updated}`);
+  }
+
+  const components = contact.name?.components || [];
+  const findKind = (...kinds: string[]) =>
+    components.find((c) => kinds.includes(c.kind))?.value || '';
+  const given = findKind('given');
+  const surname = findKind('surname');
+  // Accept JSContact-standard kinds (RFC 9553) and legacy vCard-style aliases.
+  const prefix = findKind('title', 'prefix');
+  const suffix = findKind('generation', 'suffix');
+  const additional = findKind('given2', 'additional', 'middle');
+
+  const fn = [prefix, given, additional, surname, suffix].filter(Boolean).join(' ') || contact.name?.full || '';
+  if (fn) {
+    lines.push(`FN:${encodeValue(fn)}`);
+    lines.push(`N:${encodeValue(surname)};${encodeValue(given)};${encodeValue(additional)};${encodeValue(prefix)};${encodeValue(suffix)}`);
   }
 
   if (contact.nicknames) {
-    const nick = Object.values(contact.nicknames)
-      .map((n) => n.name)
-      .filter(Boolean)
-      .join(',');
-    if (nick) lines.push(fold(`NICKNAME:${escape(nick)}`));
+    for (const nick of Object.values(contact.nicknames)) {
+      lines.push(`NICKNAME:${encodeValue(nick.name)}`);
+    }
   }
 
   if (contact.emails) {
     for (const email of Object.values(contact.emails)) {
       if (!email.address) continue;
-      lines.push(fold(`EMAIL${contextsToTypeParam(email.contexts)}:${escape(email.address)}`));
+      const type = contextToType(email.contexts);
+      const params: string[] = [];
+      if (type) params.push(`TYPE=${type}`);
+      if (email.pref) params.push(`PREF=${email.pref}`);
+      const paramStr = params.length > 0 ? `;${params.join(';')}` : '';
+      lines.push(`EMAIL${paramStr}:${email.address}`);
     }
   }
 
   if (contact.phones) {
     for (const phone of Object.values(contact.phones)) {
       if (!phone.number) continue;
-      lines.push(fold(`TEL${contextsToTypeParam(phone.contexts)}:${escape(phone.number)}`));
-    }
-  }
-
-  if (contact.addresses) {
-    for (const addr of Object.values(contact.addresses)) {
-      const street = addr.components?.find((c) => c.kind === 'name')?.value
-        || addr.components?.filter((c) => c.kind === 'number' || c.kind === 'name')
-          .map((c) => c.value).join(' ')
-        || '';
-      const locality = addr.components?.find((c) => c.kind === 'locality')?.value || '';
-      const region = addr.components?.find((c) => c.kind === 'region')?.value || '';
-      const postcode = addr.components?.find((c) => c.kind === 'postcode')?.value || '';
-      const country = addr.components?.find((c) => c.kind === 'country')?.value || addr.countryCode || '';
-      lines.push(fold(
-        `ADR${contextsToTypeParam(addr.contexts)}:;;${escape(street)};${escape(locality)};${escape(region)};${escape(postcode)};${escape(country)}`,
-      ));
+      const typeParts: string[] = [];
+      const ctxType = contextToType(phone.contexts);
+      if (ctxType) typeParts.push(ctxType);
+      if (phone.features) {
+        for (const feat of Object.keys(phone.features)) {
+          if (phone.features[feat]) typeParts.push(feat.toUpperCase());
+        }
+      }
+      const params: string[] = [];
+      if (typeParts.length > 0) params.push(`TYPE=${typeParts.join(',')}`);
+      if (phone.pref) params.push(`PREF=${phone.pref}`);
+      const paramStr = params.length > 0 ? `;${params.join(';')}` : '';
+      lines.push(`TEL${paramStr}:${phone.number}`);
     }
   }
 
   if (contact.organizations) {
     for (const org of Object.values(contact.organizations)) {
-      if (!org.name) continue;
-      const units = org.units?.map((u) => u.name).filter(Boolean).join(';') || '';
-      lines.push(fold(`ORG:${escape(org.name)}${units ? `;${escape(units)}` : ''}`));
+      if (!org.name && !(org.units && org.units.length)) continue;
+      const parts = [org.name || ''];
+      if (org.units) parts.push(...org.units.map((u) => u.name));
+      lines.push(`ORG:${parts.map(encodeValue).join(';')}`);
     }
   }
 
   if (contact.titles) {
     for (const title of Object.values(contact.titles)) {
       if (!title.name) continue;
-      lines.push(fold(`TITLE:${escape(title.name)}`));
+      if (title.kind === 'role') {
+        lines.push(`ROLE:${encodeValue(title.name)}`);
+      } else {
+        lines.push(`TITLE:${encodeValue(title.name)}`);
+      }
     }
   }
 
-  const birthday = findBirthday(contact);
-  if (birthday) {
-    const bday = anniversaryDateToVCardDate(birthday.date);
-    if (bday) lines.push(fold(`BDAY:${bday}`));
+  if (contact.addresses) {
+    for (const addr of Object.values(contact.addresses)) {
+      const type = contextToType(addr.contexts);
+      const adrParams: string[] = [];
+      if (type) adrParams.push(`TYPE=${type}`);
+      if (addr.countryCode) adrParams.push(`CC=${addr.countryCode}`);
+      if (addr.pref) adrParams.push(`PREF=${addr.pref}`);
+      const paramStr = adrParams.length > 0 ? `;${adrParams.join(';')}` : '';
+      let street = addr.street || '';
+      let locality = addr.locality || '';
+      let region = addr.region || '';
+      let postcode = addr.postcode || '';
+      let country = addr.country || '';
+      // RFC 9553 components-based address: extract flat fields for vCard ADR
+      if (addr.components && addr.components.length > 0) {
+        const findComp = (kind: string) => addr.components!.filter((c) => c.kind === kind).map((c) => c.value).join(' ');
+        const number = findComp('number');
+        const name = findComp('name');
+        street = street || [number, name].filter(Boolean).join(' ');
+        locality = locality || findComp('locality');
+        region = region || findComp('region');
+        postcode = postcode || findComp('postcode');
+        country = country || findComp('country');
+      }
+      const parts = ['', '', street, locality, region, postcode, country];
+      lines.push(`ADR${paramStr}:${parts.map(encodeValue).join(';')}`);
+    }
+  }
+
+  if (contact.anniversaries) {
+    for (const ann of Object.values(contact.anniversaries)) {
+      const dateStr = anniversaryDateToVcardString(ann.date);
+      if (ann.kind === 'birth') {
+        if (dateStr) lines.push(`BDAY:${dateStr}`);
+        if (ann.place?.fullAddress) {
+          lines.push(`BIRTHPLACE:${encodeValue(ann.place.fullAddress)}`);
+        }
+      } else if (ann.kind === 'wedding') {
+        if (dateStr) lines.push(`ANNIVERSARY:${dateStr}`);
+      } else if (ann.kind === 'death') {
+        if (dateStr) lines.push(`DEATHDATE:${dateStr}`);
+        if (ann.place?.fullAddress) {
+          lines.push(`DEATHPLACE:${encodeValue(ann.place.fullAddress)}`);
+        }
+      }
+    }
   }
 
   if (contact.onlineServices) {
     for (const svc of Object.values(contact.onlineServices)) {
       if (!svc.uri) continue;
-      lines.push(fold(`URL:${escape(svc.uri)}`));
+      if (svc.service || svc.user) {
+        // Output as IMPP for instant messaging / social profiles
+        const params: string[] = [];
+        if (svc.service) params.push(`X-SERVICE-TYPE=${svc.service}`);
+        const ctxType = contextToType(svc.contexts);
+        if (ctxType) params.push(`TYPE=${ctxType}`);
+        if (svc.pref) params.push(`PREF=${svc.pref}`);
+        const paramStr = params.length > 0 ? `;${params.join(';')}` : '';
+        lines.push(`IMPP${paramStr}:${svc.uri}`);
+      } else {
+        // Output as URL for plain web links
+        const type = contextToType(svc.contexts);
+        const params: string[] = [];
+        if (type) params.push(`TYPE=${type}`);
+        if (svc.pref) params.push(`PREF=${svc.pref}`);
+        const paramStr = params.length > 0 ? `;${params.join(';')}` : '';
+        lines.push(`URL${paramStr}:${svc.uri}`);
+      }
+    }
+  }
+
+  if (contact.keywords) {
+    const cats = Object.keys(contact.keywords).filter((k) => contact.keywords![k]);
+    if (cats.length > 0) {
+      lines.push(`CATEGORIES:${cats.map(encodeValue).join(',')}`);
+    }
+  }
+
+  if (contact.preferredLanguages) {
+    for (const lang of Object.values(contact.preferredLanguages)) {
+      const type = contextToType(lang.contexts);
+      const params: string[] = [];
+      if (type) params.push(`TYPE=${type}`);
+      if (lang.pref) params.push(`PREF=${lang.pref}`);
+      const paramStr = params.length > 0 ? `;${params.join(';')}` : '';
+      lines.push(`LANG${paramStr}:${lang.language}`);
+    }
+  }
+
+  if (contact.relatedTo) {
+    for (const [uri, rel] of Object.entries(contact.relatedTo)) {
+      const relType = rel.relation ? Object.keys(rel.relation).find((k) => rel.relation![k]) : undefined;
+      const typeParam = relType ? `;TYPE=${relType}` : '';
+      lines.push(`RELATED${typeParam}:${uri}`);
+    }
+  }
+
+  if (contact.cryptoKeys) {
+    for (const key of Object.values(contact.cryptoKeys)) {
+      const type = contextToType(key.contexts);
+      const params: string[] = [];
+      if (type) params.push(`TYPE=${type}`);
+      if (key.mediaType) params.push(`MEDIATYPE=${key.mediaType}`);
+      const paramStr = params.length > 0 ? `;${params.join(';')}` : '';
+      lines.push(`KEY${paramStr}:${key.uri}`);
+    }
+  }
+
+  if (contact.personalInfo) {
+    // RFC 6715 - emit EXPERTISE / HOBBY / INTEREST with LEVEL.
+    const levelOut: Record<string, Record<string, string>> = {
+      expertise: { high: 'expert', medium: 'average', low: 'beginner' },
+      hobby: { high: 'high', medium: 'medium', low: 'low' },
+      interest: { high: 'high', medium: 'medium', low: 'low' },
+    };
+    for (const info of Object.values(contact.personalInfo)) {
+      const propMap: Record<string, string> = {
+        expertise: 'EXPERTISE', hobby: 'HOBBY', interest: 'INTEREST',
+      };
+      const prop = propMap[info.kind];
+      if (!prop) continue;
+      const levelParam = info.level && levelOut[info.kind]?.[info.level]
+        ? `;LEVEL=${levelOut[info.kind][info.level]}` : '';
+      lines.push(`${prop}${levelParam}:${encodeValue(info.value)}`);
+    }
+  }
+
+  if (contact.directories) {
+    for (const dir of Object.values(contact.directories)) {
+      const mt = dir.mediaType ? `;MEDIATYPE=${dir.mediaType}` : '';
+      lines.push(`ORG-DIRECTORY${mt}:${dir.uri}`);
+    }
+  }
+
+  if (contact.links) {
+    // RFC 8605 CONTACT-URI for kind=contact; everything else falls back to URL.
+    for (const link of Object.values(contact.links)) {
+      const params: string[] = [];
+      const type = contextToType(link.contexts);
+      if (type) params.push(`TYPE=${type}`);
+      if (link.pref) params.push(`PREF=${link.pref}`);
+      const paramStr = params.length > 0 ? `;${params.join(';')}` : '';
+      const prop = link.kind === 'contact' ? 'CONTACT-URI' : 'URL';
+      lines.push(`${prop}${paramStr}:${link.uri}`);
     }
   }
 
   if (contact.notes) {
-    for (const note of Object.values(contact.notes)) {
-      if (!note.note) continue;
-      lines.push(fold(`NOTE:${escape(note.note)}`));
+    for (const n of Object.values(contact.notes)) {
+      if (!n.note) continue;
+      lines.push(`NOTE:${encodeValue(n.note)}`);
     }
   }
 
-  const keywords = getContactKeywords(contact);
-  if (keywords.length > 0) {
-    lines.push(fold(`CATEGORIES:${keywords.map(escape).join(',')}`));
+  if (contact.members) {
+    for (const memberId of Object.keys(contact.members)) {
+      if (contact.members[memberId]) {
+        lines.push(`MEMBER:urn:uuid:${memberId}`);
+      }
+    }
   }
 
-  if (contact.uid) {
-    lines.push(fold(`UID:${escape(contact.uid)}`));
+  if (contact.media) {
+    for (const media of Object.values(contact.media)) {
+      if (media.uri) {
+        const prop = media.kind === 'logo' ? 'LOGO' : media.kind === 'sound' ? 'SOUND' : 'PHOTO';
+        if (media.uri.startsWith('data:')) {
+          const match = media.uri.match(/^data:([^;]+);base64,(.+)$/);
+          if (match) {
+            lines.push(`${prop};ENCODING=b;TYPE=${match[1]}:${match[2]}`);
+          }
+        } else {
+          const mt = media.mediaType ? `;MEDIATYPE=${media.mediaType}` : '';
+          lines.push(`${prop};VALUE=URI${mt}:${media.uri}`);
+        }
+      }
+    }
+  }
+
+  // GEO and TZ from addresses
+  if (contact.addresses) {
+    for (const addr of Object.values(contact.addresses)) {
+      if (addr.coordinates) {
+        lines.push(`GEO:${addr.coordinates}`);
+      }
+      if (addr.timeZone) {
+        lines.push(`TZ:${addr.timeZone}`);
+      }
+    }
+  }
+
+  if (contact.speakToAs) {
+    const sex = contact.speakToAs.grammaticalGender
+      ? grammaticalGenderToVcardSex(contact.speakToAs.grammaticalGender)
+      : '';
+    const pronouns = contact.speakToAs.pronouns;
+    const identity = pronouns ? Object.values(pronouns)[0]?.pronouns || '' : '';
+    if (sex || identity) {
+      lines.push(`GENDER:${sex}${identity ? `;${identity}` : ''}`);
+    }
+  }
+
+  if (contact.calendarUri) {
+    lines.push(`CALURI:${contact.calendarUri}`);
+  }
+
+  if (contact.schedulingUri) {
+    lines.push(`CALADRURI:${contact.schedulingUri}`);
+  }
+
+  if (contact.freeBusyUri) {
+    lines.push(`FBURL:${contact.freeBusyUri}`);
+  }
+
+  if (contact.source) {
+    lines.push(`SOURCE:${contact.source}`);
+  }
+
+  if (contact.created) {
+    // RFC 9554 §3.1 - CREATED is a timestamp; emit as-is for round-trip.
+    lines.push(`CREATED:${contact.created}`);
   }
 
   lines.push('END:VCARD');
   return lines.join('\r\n');
 }
 
+export function detectDuplicates(
+  existing: ContactCard[],
+  incoming: ContactCard[],
+): Map<number, string> {
+  const dupes = new Map<number, string>();
+  const existingEmails = new Map<string, string>();
+
+  for (const c of existing) {
+    if (c.emails) {
+      for (const e of Object.values(c.emails)) {
+        if (e.address) existingEmails.set(e.address.toLowerCase(), c.id);
+      }
+    }
+  }
+
+  incoming.forEach((card, idx) => {
+    if (card.emails) {
+      for (const e of Object.values(card.emails)) {
+        if (!e.address) continue;
+        const match = existingEmails.get(e.address.toLowerCase());
+        if (match) {
+          dupes.set(idx, match);
+          return;
+        }
+      }
+    }
+  });
+
+  return dupes;
+}
+
+// ─── Backward-compatible single/multi export helpers ─────────────
+// Older call sites (ContactDetailScreen, ContactsSettings) import these names.
+export function contactToVCard(contact: ContactCard): string {
+  return generateVCard([contact]);
+}
+
 export function contactsToVCard(contacts: ContactCard[]): string {
-  return contacts.map(contactToVCard).join('\r\n');
+  return generateVCard(contacts);
 }
diff --git a/src/navigation/types.ts b/src/navigation/types.ts
index 8a99fd3e..ba70d42d 100644
--- a/src/navigation/types.ts
+++ b/src/navigation/types.ts
@@ -23,6 +23,8 @@ export type RootStackParamList = {
   ContactForm: { contactId?: string; addressBookId?: string; asGroup?: boolean };
   GroupDetail: { groupId: string };
   AddAccount: undefined;
+  Scheduled: undefined;
+  UnifiedInbox: undefined;
 };
 
 export type MainTabsParamList = {
diff --git a/src/screens/CalendarScreen.tsx b/src/screens/CalendarScreen.tsx
index 4f690166..a66a7b28 100644
--- a/src/screens/CalendarScreen.tsx
+++ b/src/screens/CalendarScreen.tsx
@@ -16,6 +16,7 @@ import {
   CalendarDays,
   LayoutGrid,
   List as ListIcon,
+  ListChecks,
   Menu,
 } from 'lucide-react-native';
 import {
@@ -47,11 +48,17 @@ import {
   type RecurrenceEditScope,
 } from '../components/calendar/RecurrenceScopeDialog';
 import { CalendarSidebarDrawer } from '../components/calendar/CalendarSidebarDrawer';
+import { TasksSheet } from '../components/calendar/TasksSheet';
+import { ICalImportSheet } from '../components/calendar/ICalImportSheet';
+import { ICalSubscriptionSheet } from '../components/calendar/ICalSubscriptionSheet';
 import {
   buildEventDayIndex,
   eventsOnDayFromIndex,
   type EventDayIndex,
 } from '../lib/calendar-utils';
+import { buildReplyTo } from '../lib/calendar-invitation';
+import { generateBirthdayEvents, createBirthdayCalendar, BIRTHDAY_CALENDAR_ID } from '../lib/birthday-calendar';
+import { useContactsStore } from '../stores/contacts-store';
 import type { Calendar, CalendarEvent } from '../api/types';
 
 type ViewMode = 'month' | 'week' | 'agenda';
@@ -108,6 +115,9 @@ export default function CalendarScreen() {
   const calendarFirstDayOfWeek = useSettingsStore((s) => s.calendarFirstDayOfWeek);
   const calendarShowWeekNumbers = useSettingsStore((s) => s.calendarShowWeekNumbers);
   const calendarTimeFormat = useSettingsStore((s) => s.calendarTimeFormat);
+  const showBirthdayCalendar = useSettingsStore((s) => s.showBirthdayCalendar);
+  const enableCalendarTasks = useSettingsStore((s) => s.enableCalendarTasks);
+  const contacts = useContactsStore((s) => s.contacts);
 
   const [currentDate, setCurrentDate] = React.useState(new Date());
   const [selectedDate, setSelectedDate] = React.useState(new Date());
@@ -125,6 +135,9 @@ export default function CalendarScreen() {
   const [modalVisible, setModalVisible] = React.useState(false);
   const [pendingAction, setPendingAction] = React.useState<PendingAction>(null);
   const [sidebarVisible, setSidebarVisible] = React.useState(false);
+  const [tasksVisible, setTasksVisible] = React.useState(false);
+  const [importVisible, setImportVisible] = React.useState(false);
+  const [subscriptionsVisible, setSubscriptionsVisible] = React.useState(false);
   const [refreshing, setRefreshing] = React.useState(false);
 
   const hydrate = useCalendarStore((s) => s.hydrate);
@@ -134,12 +147,36 @@ export default function CalendarScreen() {
   const createEvent = useCalendarStore((s) => s.createEvent);
   const updateEvent = useCalendarStore((s) => s.updateEvent);
   const deleteEvent = useCalendarStore((s) => s.deleteEvent);
+  const rsvpEvent = useCalendarStore((s) => s.rsvpEvent);
+  const importEvents = useCalendarStore((s) => s.importEvents);
+  const tasks = useCalendarStore((s) => s.tasks);
+  const createTask = useCalendarStore((s) => s.createTask);
+  const toggleTaskComplete = useCalendarStore((s) => s.toggleTaskComplete);
+  const deleteTask = useCalendarStore((s) => s.deleteTask);
   const toggleCalendarVisibility = useCalendarStore((s) => s.toggleCalendarVisibility);
-  const allCalendars = useCalendarStore((s) => s.calendars);
+  const storeCalendars = useCalendarStore((s) => s.calendars);
   const hiddenCalendarIds = useCalendarStore((s) => s.hiddenCalendarIds);
   const loading = useCalendarStore((s) => s.loading);
   const error = useCalendarStore((s) => s.error);
-  const allEvents = useCalendarStore((s) => s.events);
+  const storeEvents = useCalendarStore((s) => s.events);
+
+  // The birthday calendar is a client-side virtual calendar: its events are
+  // generated from contacts for the visible range and merged in alongside the
+  // server calendars. Toggling it on/off is instant (no refetch).
+  const birthdayEvents = React.useMemo(() => {
+    if (!showBirthdayCalendar) return [];
+    const { after, before } = rangeForView(viewMode, currentDate, calendarFirstDayOfWeek);
+    return generateBirthdayEvents(contacts, after.toISOString(), before.toISOString());
+  }, [showBirthdayCalendar, contacts, viewMode, currentDate, calendarFirstDayOfWeek]);
+
+  const allCalendars = React.useMemo(
+    () => (showBirthdayCalendar ? [...storeCalendars, createBirthdayCalendar()] : storeCalendars),
+    [storeCalendars, showBirthdayCalendar],
+  );
+  const allEvents = React.useMemo(
+    () => (birthdayEvents.length > 0 ? [...storeEvents, ...birthdayEvents] : storeEvents),
+    [storeEvents, birthdayEvents],
+  );
 
   const calendars = React.useMemo(
     () => allCalendars.filter((c) => !hiddenCalendarIds.includes(c.id)),
@@ -210,23 +247,30 @@ export default function CalendarScreen() {
     setModalVisible(true);
   }, []);
 
+  const isReadOnlyEvent = React.useCallback(
+    (event: CalendarEvent) => !!event.calendarIds?.[BIRTHDAY_CALENDAR_ID],
+    [],
+  );
+
   const handleEditFromDetail = React.useCallback((event: CalendarEvent) => {
+    if (isReadOnlyEvent(event)) { setDetailEvent(null); return; }
     setDetailEvent(null);
     if (event.recurrenceRules?.length || event.originalId) {
       setPendingAction({ kind: 'edit', event });
     } else {
       openEditDirect(event);
     }
-  }, [openEditDirect]);
+  }, [openEditDirect, isReadOnlyEvent]);
 
   const handleDeleteFromDetail = React.useCallback((event: CalendarEvent) => {
+    if (isReadOnlyEvent(event)) { setDetailEvent(null); return; }
     setDetailEvent(null);
     if (event.recurrenceRules?.length || event.originalId) {
       setPendingAction({ kind: 'delete', event });
     } else {
       void deleteEvent(event.id);
     }
-  }, [deleteEvent]);
+  }, [deleteEvent, isReadOnlyEvent]);
 
   const handleScopeSelect = React.useCallback(
     async (scope: RecurrenceEditScope) => {
@@ -293,6 +337,15 @@ export default function CalendarScreen() {
           </Text>
         </View>
         <View style={styles.headerActions}>
+          {enableCalendarTasks && (
+            <Pressable
+              style={styles.headerBtn}
+              onPress={() => setTasksVisible(true)}
+              hitSlop={6}
+            >
+              <ListChecks size={20} color={c.text} />
+            </Pressable>
+          )}
           <View style={styles.viewToggle}>
             {(['month', 'week', 'agenda'] as ViewMode[]).map((mode) => {
               const Icon =
@@ -397,6 +450,20 @@ export default function CalendarScreen() {
         onClose={() => setDetailEvent(null)}
         onEdit={handleEditFromDetail}
         onDelete={handleDeleteFromDetail}
+        onRsvp={async (ev, participantId, status) => {
+          await rsvpEvent(ev.id, participantId, status, buildReplyTo(ev));
+          setDetailEvent((cur) =>
+            cur && cur.id === ev.id && cur.participants?.[participantId]
+              ? {
+                  ...cur,
+                  participants: {
+                    ...cur.participants,
+                    [participantId]: { ...cur.participants[participantId], participationStatus: status },
+                  },
+                }
+              : cur,
+          );
+        }}
       />
 
       <EventModal
@@ -422,6 +489,30 @@ export default function CalendarScreen() {
         hiddenCalendarIds={hiddenCalendarIds}
         onToggle={toggleCalendarVisibility}
         onClose={() => setSidebarVisible(false)}
+        onImport={() => { setSidebarVisible(false); setImportVisible(true); }}
+        onManageSubscriptions={() => { setSidebarVisible(false); setSubscriptionsVisible(true); }}
+      />
+
+      <TasksSheet
+        visible={tasksVisible}
+        tasks={tasks}
+        calendars={allCalendars}
+        onClose={() => setTasksVisible(false)}
+        onCreate={createTask}
+        onToggle={toggleTaskComplete}
+        onDelete={deleteTask}
+      />
+
+      <ICalImportSheet
+        visible={importVisible}
+        calendars={storeCalendars}
+        onClose={() => setImportVisible(false)}
+        onImport={importEvents}
+      />
+
+      <ICalSubscriptionSheet
+        visible={subscriptionsVisible}
+        onClose={() => setSubscriptionsVisible(false)}
       />
     </SafeAreaView>
   );
diff --git a/src/screens/ComposeScreen.tsx b/src/screens/ComposeScreen.tsx
index 748e923f..9b4d3c43 100644
--- a/src/screens/ComposeScreen.tsx
+++ b/src/screens/ComposeScreen.tsx
@@ -9,8 +9,9 @@ import {
   X, Send, Paperclip, ChevronDown, Bold, Italic, Underline, Strikethrough,
   List, ListOrdered, Link2, Link2Off, Image as ImageIcon, Quote,
   Heading1, Heading2, AlignLeft, AlignCenter, AlignRight, RemoveFormatting,
-  Undo2, Redo2, FileText,
+  Undo2, Redo2, FileText, Clock, Check,
 } from 'lucide-react-native';
+import DateTimePicker, { type DateTimePickerEvent } from '@react-native-community/datetimepicker';
 import * as ImagePicker from 'expo-image-picker';
 import * as FileSystem from 'expo-file-system/legacy';
 import { File as FsFile } from 'expo-file-system';
@@ -33,6 +34,7 @@ import {
 } from '../lib/contact-utils';
 import { getIdentities } from '../api/identity';
 import { sendEmail, type OutgoingAttachment } from '../api/email';
+import { jmapClient } from '../api/jmap-client';
 import { uploadBlob } from '../api/blob';
 import { buildInitialHtml, htmlToPlainText, rewriteInlineImages } from '../lib/compose-html';
 import { stripDangerousTags } from '../lib/email-html';
@@ -256,11 +258,17 @@ export default function ComposeScreen({ route, navigation }: Props) {
   const [identityError, setIdentityError] = React.useState<string | null>(null);
   const [sending, setSending] = React.useState(false);
   const [selectedIdentityId, setSelectedIdentityId] = React.useState<string | null>(null);
+  const [scheduleSheetOpen, setScheduleSheetOpen] = React.useState(false);
+  // Custom date/time picker stage. iOS shows one 'datetime' spinner; Android
+  // can only show one field at a time, so we walk date → time.
+  const [customStage, setCustomStage] = React.useState<'datetime' | 'date' | 'time' | null>(null);
+  const customDraftRef = React.useRef<Date>(new Date());
 
   const autoSelectReplyIdentity = useSettingsStore((s) => s.autoSelectReplyIdentity);
   const plainTextMode = useSettingsStore((s) => s.plainTextMode);
   const attachmentReminderEnabled = useSettingsStore((s) => s.attachmentReminderEnabled);
   const attachmentReminderKeywords = useSettingsStore((s) => s.attachmentReminderKeywords);
+  const sendDelaySeconds = useSettingsStore((s) => s.sendDelaySeconds);
 
   const initialTo = React.useMemo<Recipient[]>(() => {
     if (!replyTo) {
@@ -737,7 +745,96 @@ export default function ComposeScreen({ route, navigation }: Props) {
     });
   };
 
-  const onSend = async () => {
+  // Translate an absolute "send at" time into the HOLDFOR seconds the server
+  // expects, clamping to what it actually supports. Returns null (and alerts)
+  // when scheduling isn't possible so the caller can abort.
+  const resolveHoldForScheduledAt = (date: Date): number | null => {
+    const seconds = Math.ceil((date.getTime() - Date.now()) / 1000);
+    if (seconds <= 0) {
+      Alert.alert(
+        t('email_composer.schedule_past_title', 'Pick a future time'),
+        t('email_composer.schedule_past_body', 'The scheduled time must be in the future.'),
+      );
+      return null;
+    }
+    if (!jmapClient.hasDelayedSend()) {
+      Alert.alert(
+        t('email_composer.schedule_unsupported_title', 'Scheduling unavailable'),
+        t('email_composer.schedule_unsupported_body', 'This mail server does not support scheduled send.'),
+      );
+      return null;
+    }
+    const max = jmapClient.getMaxDelayedSend();
+    if (max > 0 && seconds > max) {
+      Alert.alert(
+        t('email_composer.schedule_too_late_title', 'Too far ahead'),
+        t('email_composer.schedule_too_late_body', 'That is later than this server allows. Pick an earlier time.'),
+      );
+      return null;
+    }
+    return seconds;
+  };
+
+  // The Send button: applies the global undo-send delay when the server
+  // supports it, otherwise sends immediately.
+  const onSend = () => {
+    const holdFor = sendDelaySeconds > 0 && jmapClient.hasDelayedSend() ? sendDelaySeconds : undefined;
+    void performSend(holdFor);
+  };
+
+  const onScheduleConfirm = (date: Date) => {
+    const holdFor = resolveHoldForScheduledAt(date);
+    if (holdFor == null) return;
+    setScheduleSheetOpen(false);
+    void performSend(holdFor, date);
+  };
+
+  const schedulePresets = React.useMemo(() => {
+    const now = new Date();
+    const inHours = (h: number) => new Date(now.getTime() + h * 3600 * 1000);
+    const tomorrowMorning = new Date(now);
+    tomorrowMorning.setDate(tomorrowMorning.getDate() + 1);
+    tomorrowMorning.setHours(8, 0, 0, 0);
+    return [
+      { label: t('email_composer.schedule_in_1h', 'In 1 hour'), date: inHours(1) },
+      { label: t('email_composer.schedule_in_3h', 'In 3 hours'), date: inHours(3) },
+      { label: t('email_composer.schedule_tomorrow', 'Tomorrow, 8:00 AM'), date: tomorrowMorning },
+    ];
+  }, [t, scheduleSheetOpen]);
+
+  const startCustomPicker = () => {
+    customDraftRef.current = new Date(Date.now() + 3600 * 1000);
+    setScheduleSheetOpen(false);
+    setCustomStage(Platform.OS === 'ios' ? 'datetime' : 'date');
+  };
+
+  const onCustomPickerChange = (event: DateTimePickerEvent, selected?: Date) => {
+    if (event.type === 'dismissed' || !selected) {
+      setCustomStage(null);
+      return;
+    }
+    if (Platform.OS === 'ios') {
+      // Single spinner — keep it open, just remember the latest value.
+      customDraftRef.current = selected;
+      return;
+    }
+    // Android: combine the date step with the existing time, then ask for time.
+    if (customStage === 'date') {
+      const d = new Date(customDraftRef.current);
+      d.setFullYear(selected.getFullYear(), selected.getMonth(), selected.getDate());
+      customDraftRef.current = d;
+      setCustomStage('time');
+      return;
+    }
+    if (customStage === 'time') {
+      const d = new Date(customDraftRef.current);
+      d.setHours(selected.getHours(), selected.getMinutes(), 0, 0);
+      setCustomStage(null);
+      onScheduleConfirm(d);
+    }
+  };
+
+  const performSend = async (holdForSeconds?: number, scheduledAt?: Date) => {
     if (!canSend || !primaryIdentity || !sentMailbox) return;
     if (!(await passesAttachmentReminder())) return;
     setSending(true);
@@ -775,7 +872,7 @@ export default function ComposeScreen({ route, navigation }: Props) {
 
       const outgoing = [...inlineFromBody, ...fileAttachments];
 
-      await sendEmail(
+      const result = await sendEmail(
         {
           from,
           to: finalTo.map((r) => ({ name: r.name || undefined, email: r.email })),
@@ -793,7 +890,21 @@ export default function ComposeScreen({ route, navigation }: Props) {
         },
         primaryIdentity.id,
         sentMailbox.id,
+        holdForSeconds,
       );
+      // Confirm an explicit "send later" so the user knows it didn't go out
+      // now. The brief undo-send delay stays silent — it's meant to be
+      // invisible unless the user cancels from the Scheduled view.
+      if (scheduledAt && result.scheduled) {
+        const when = result.sendAt ? new Date(result.sendAt) : scheduledAt;
+        Alert.alert(
+          t('email_composer.scheduled_title', 'Scheduled'),
+          t('email_composer.scheduled_body', 'Your message will be sent at {time}.').replace(
+            '{time}',
+            when.toLocaleString(),
+          ),
+        );
+      }
       navigation.goBack();
     } catch (e) {
       Alert.alert(
@@ -828,10 +939,18 @@ export default function ComposeScreen({ route, navigation }: Props) {
           >
             <Paperclip size={20} color={c.text} />
           </Pressable>
+          <Pressable
+            onPress={() => setScheduleSheetOpen(true)}
+            style={styles.headerBtn}
+            hitSlop={8}
+            disabled={!canSend}
+          >
+            <Clock size={20} color={canSend ? c.text : c.textMuted} />
+          </Pressable>
           <Button
             variant="default"
             size="sm"
-            onPress={() => { void onSend(); }}
+            onPress={onSend}
             disabled={!canSend}
             icon={
               sending ? (
@@ -1083,6 +1202,93 @@ export default function ComposeScreen({ route, navigation }: Props) {
           </View>
         </View>
       </Modal>
+
+      {/* Schedule send sheet */}
+      <Modal
+        visible={scheduleSheetOpen}
+        transparent
+        animationType="fade"
+        onRequestClose={() => setScheduleSheetOpen(false)}
+      >
+        <Pressable style={styles.modalBackdrop} onPress={() => setScheduleSheetOpen(false)}>
+          <Pressable style={styles.scheduleCard} onPress={() => {}}>
+            <Text style={styles.modalTitle}>
+              {t('email_composer.schedule_send', 'Schedule send')}
+            </Text>
+            {!jmapClient.hasDelayedSend() && (
+              <Text style={styles.scheduleWarning}>
+                {t('email_composer.schedule_unsupported_body', 'This mail server does not support scheduled send.')}
+              </Text>
+            )}
+            {schedulePresets.map((preset) => (
+              <Pressable
+                key={preset.label}
+                style={styles.scheduleRow}
+                onPress={() => onScheduleConfirm(preset.date)}
+              >
+                <Clock size={16} color={c.textSecondary} />
+                <Text style={styles.scheduleRowLabel}>{preset.label}</Text>
+                <Text style={styles.scheduleRowTime}>
+                  {preset.date.toLocaleString(undefined, {
+                    weekday: 'short', hour: 'numeric', minute: '2-digit',
+                  })}
+                </Text>
+              </Pressable>
+            ))}
+            <Pressable style={styles.scheduleRow} onPress={startCustomPicker}>
+              <Check size={16} color={c.textSecondary} />
+              <Text style={styles.scheduleRowLabel}>
+                {t('email_composer.schedule_custom', 'Pick date & time…')}
+              </Text>
+            </Pressable>
+            <Pressable
+              style={styles.scheduleCancel}
+              onPress={() => setScheduleSheetOpen(false)}
+            >
+              <Text style={styles.modalCancelText}>{t('email_composer.cancel', 'Cancel')}</Text>
+            </Pressable>
+          </Pressable>
+        </Pressable>
+      </Modal>
+
+      {customStage !== null && Platform.OS === 'ios' && (
+        <Modal transparent animationType="fade" onRequestClose={() => setCustomStage(null)}>
+          <Pressable style={styles.modalBackdrop} onPress={() => setCustomStage(null)}>
+            <Pressable style={styles.scheduleCard} onPress={() => {}}>
+              <DateTimePicker
+                value={customDraftRef.current}
+                mode="datetime"
+                display="spinner"
+                minimumDate={new Date()}
+                onChange={onCustomPickerChange}
+              />
+              <View style={styles.modalActions}>
+                <Pressable style={styles.modalCancel} onPress={() => setCustomStage(null)}>
+                  <Text style={styles.modalCancelText}>{t('email_composer.cancel', 'Cancel')}</Text>
+                </Pressable>
+                <Pressable
+                  style={styles.modalConfirm}
+                  onPress={() => { setCustomStage(null); onScheduleConfirm(customDraftRef.current); }}
+                >
+                  <Text style={styles.modalConfirmText}>
+                    {t('email_composer.schedule_send', 'Schedule send')}
+                  </Text>
+                </Pressable>
+              </View>
+            </Pressable>
+          </Pressable>
+        </Modal>
+      )}
+
+      {customStage !== null && Platform.OS !== 'ios' && (
+        <DateTimePicker
+          value={customDraftRef.current}
+          mode={customStage === 'time' ? 'time' : 'date'}
+          display="default"
+          minimumDate={customStage === 'date' ? new Date() : undefined}
+          onChange={onCustomPickerChange}
+        />
+      )}
     </SafeAreaView>
   );
 }
@@ -1302,5 +1508,34 @@ function makeStyles(c: ThemePalette) {
     backgroundColor: c.primary,
   },
   modalConfirmText: { ...typography.bodyMedium, color: c.primaryForeground },
+  scheduleCard: {
+    width: '100%',
+    maxWidth: 420,
+    backgroundColor: c.background,
+    borderRadius: radius.md,
+    borderWidth: 1,
+    borderColor: c.border,
+    padding: spacing.lg,
+    gap: spacing.xs,
+  },
+  scheduleWarning: {
+    ...typography.caption,
+    color: c.error,
+    marginBottom: spacing.xs,
+  },
+  scheduleRow: {
+    flexDirection: 'row',
+    alignItems: 'center',
+    gap: spacing.sm,
+    paddingVertical: spacing.sm + 2,
+    minHeight: 44,
+  },
+  scheduleRowLabel: { ...typography.body, color: c.text, flex: 1 },
+  scheduleRowTime: { ...typography.caption, color: c.textMuted },
+  scheduleCancel: {
+    alignItems: 'center',
+    paddingVertical: spacing.sm,
+    marginTop: spacing.xs,
+  },
   });
 }
diff --git a/src/screens/ContactDetailScreen.tsx b/src/screens/ContactDetailScreen.tsx
index 94979ec8..6c239b01 100644
--- a/src/screens/ContactDetailScreen.tsx
+++ b/src/screens/ContactDetailScreen.tsx
@@ -12,7 +12,7 @@ import {
   ArrowLeft, Pencil, Trash2, Mail, Phone, MessageSquare, Share2, MapPin,
   Building, Cake, Heart, Globe, Tag, Users, FileText, BookUser,
   Copy, MoreHorizontal, Calendar as CalendarIcon, UserCircle, Languages,
-  Clock, KeyRound,
+  Clock, KeyRound, FolderInput,
 } from 'lucide-react-native';
 import type { RootStackParamList } from '../navigation/types';
 import type { ContactCard } from '../api/types';
@@ -27,6 +27,7 @@ import { contactToVCard } from '../lib/vcard';
 import SenderAvatar from '../components/SenderAvatar';
 import Dialog from '../components/Dialog';
 import { ContactActivity } from '../components/contacts/ContactActivity';
+import AddressBookPickerSheet from '../components/contacts/AddressBookPickerSheet';
 import { spacing, radius, typography, type ThemePalette } from '../theme/tokens';
 import { useColors } from '../theme/colors';
 
@@ -84,9 +85,11 @@ export default function ContactDetailScreen() {
   const allContacts = useContactsStore((s) => s.contacts);
   const deleteContact = useContactsStore((s) => s.deleteContact);
   const createContact = useContactsStore((s) => s.createContact);
+  const moveContactsToAddressBook = useContactsStore((s) => s.moveContactsToAddressBook);
 
   const [confirmDelete, setConfirmDelete] = React.useState(false);
   const [moreOpen, setMoreOpen] = React.useState(false);
+  const [moveOpen, setMoveOpen] = React.useState(false);
 
   if (!contact) {
     return (
@@ -232,12 +235,26 @@ export default function ContactDetailScreen() {
     }
   };
 
+  const doMove = async (bookId: string) => {
+    setMoveOpen(false);
+    try {
+      await moveContactsToAddressBook([contact.id], bookId);
+    } catch (err) {
+      Alert.alert('Move failed', err instanceof Error ? err.message : 'Unknown error');
+    }
+  };
+
   const moreItems = [
     !isGroup(contact) && {
       icon: <Copy size={16} color={c.text} />,
       label: 'Duplicate',
       onPress: () => { void doDuplicate(); },
     },
+    addressBooks.length > 0 && {
+      icon: <FolderInput size={16} color={c.text} />,
+      label: 'Move to address book',
+      onPress: () => setMoveOpen(true),
+    },
     {
       icon: <Share2 size={16} color={c.text} />,
       label: 'Export vCard',
@@ -614,6 +631,13 @@ export default function ContactDetailScreen() {
         items={moreItems}
         onClose={() => setMoreOpen(false)}
       />
+
+      <AddressBookPickerSheet
+        visible={moveOpen}
+        onClose={() => setMoveOpen(false)}
+        currentBookId={bookIds[0] ?? null}
+        onPick={(id) => { void doMove(id); }}
+      />
     </SafeAreaView>
   );
 }
diff --git a/src/screens/ContactsScreen.tsx b/src/screens/ContactsScreen.tsx
index d3891876..b63c9021 100644
--- a/src/screens/ContactsScreen.tsx
+++ b/src/screens/ContactsScreen.tsx
@@ -9,12 +9,13 @@ import {
   ActivityIndicator,
   RefreshControl,
   ScrollView,
+  Alert,
 } from 'react-native';
 import { SafeAreaView } from 'react-native-safe-area-context';
 import { useNavigation } from '@react-navigation/native';
 import type { NativeStackNavigationProp } from '@react-navigation/native-stack';
 import {
-  Search, Plus, UserCircle, X, Menu, Trash2, Tag, FolderInput,
+  Search, Plus, UserCircle, X, Menu, Trash2, Tag, FolderInput, Upload,
 } from 'lucide-react-native';
 import type { RootStackParamList } from '../navigation/types';
 import type { ContactCard } from '../api/types';
@@ -25,7 +26,12 @@ import {
   type ContactCategory,
 } from '../stores/contacts-store';
 import { getContactDisplayName, isGroup, matchesContactSearch } from '../lib/contact-utils';
-import { ContactListRow } from '../components/contacts';
+import {
+  ContactListRow,
+  AddressBookPickerSheet,
+  ContactImportSheet,
+  TagAssignSheet,
+} from '../components/contacts';
 import Dialog from '../components/Dialog';
 import ContactsSidebarDrawer from '../components/contacts/ContactsSidebarDrawer';
 import { useSettingsStore } from '../stores/settings-store';
@@ -91,6 +97,8 @@ export default function ContactsScreen() {
   const fetchContacts = useContactsStore((s) => s.fetchContacts);
   const hydrate = useContactsStore((s) => s.hydrate);
   const bulkDelete = useContactsStore((s) => s.bulkDelete);
+  const moveContactsToAddressBook = useContactsStore((s) => s.moveContactsToAddressBook);
+  const addKeywordToContacts = useContactsStore((s) => s.addKeywordToContacts);
   const setSelectedCategory = useContactsStore((s) => s.setSelectedCategory);
   const groupByLetter = useSettingsStore((s) => s.groupContactsByLetter);
 
@@ -99,6 +107,11 @@ export default function ContactsScreen() {
   const [drawerOpen, setDrawerOpen] = React.useState(false);
   const [selection, setSelection] = React.useState<Set<string>>(new Set());
   const [confirmBulkDelete, setConfirmBulkDelete] = React.useState(false);
+  const [moveSheetOpen, setMoveSheetOpen] = React.useState(false);
+  const [tagSheetOpen, setTagSheetOpen] = React.useState(false);
+  const [importOpen, setImportOpen] = React.useState(false);
+  const [importTargetOpen, setImportTargetOpen] = React.useState(false);
+  const [importTargetBookId, setImportTargetBookId] = React.useState<string | null>(null);
 
   React.useEffect(() => {
     void hydrate();
@@ -183,6 +196,45 @@ export default function ContactsScreen() {
     await bulkDelete(ids);
   };
 
+  // Default target for moves/imports: the currently-viewed address book, else
+  // the first available book.
+  const defaultBookId = React.useMemo(() => {
+    if (selectedCategory.type === 'addressBook') return selectedCategory.addressBookId;
+    return addressBooks[0]?.id ?? null;
+  }, [selectedCategory, addressBooks]);
+
+  const handleBulkMove = async (bookId: string) => {
+    const ids = Array.from(selection);
+    setMoveSheetOpen(false);
+    clearSelection();
+    try {
+      await moveContactsToAddressBook(ids, bookId);
+    } catch (err) {
+      Alert.alert('Move failed', err instanceof Error ? err.message : 'Unknown error');
+    }
+  };
+
+  const handleBulkTag = async (keyword: string) => {
+    const ids = Array.from(selection);
+    setTagSheetOpen(false);
+    clearSelection();
+    try {
+      await addKeywordToContacts(ids, keyword);
+    } catch (err) {
+      Alert.alert('Tagging failed', err instanceof Error ? err.message : 'Unknown error');
+    }
+  };
+
+  const openImport = () => {
+    setImportTargetBookId(defaultBookId);
+    setImportOpen(true);
+  };
+
+  const importTargetName = React.useMemo(
+    () => addressBooks.find((b) => b.id === importTargetBookId)?.name,
+    [addressBooks, importTargetBookId],
+  );
+
   const title = categoryTitle(selectedCategory, addressBooks, groups);
 
   // Top chip row: All / per-address-book / Groups
@@ -234,6 +286,22 @@ export default function ContactsScreen() {
             </Pressable>
             <Text style={styles.headerTitle}>{selection.size} selected</Text>
             <View style={styles.headerActions}>
+              {addressBooks.length > 0 && (
+                <Pressable
+                  onPress={() => setMoveSheetOpen(true)}
+                  style={styles.headerIconBtn}
+                  hitSlop={8}
+                >
+                  <FolderInput size={20} color={c.text} />
+                </Pressable>
+              )}
+              <Pressable
+                onPress={() => setTagSheetOpen(true)}
+                style={styles.headerIconBtn}
+                hitSlop={8}
+              >
+                <Tag size={20} color={c.text} />
+              </Pressable>
               <Pressable
                 onPress={() => setConfirmBulkDelete(true)}
                 style={styles.headerIconBtn}
@@ -258,6 +326,13 @@ export default function ContactsScreen() {
               >
                 <Search size={20} color={c.text} />
               </Pressable>
+              <Pressable
+                onPress={openImport}
+                style={styles.headerIconBtn}
+                hitSlop={8}
+              >
+                <Upload size={20} color={c.text} />
+              </Pressable>
               <Pressable
                 onPress={() => navigation.navigate('ContactForm', {})}
                 style={styles.addBtn}
@@ -380,6 +455,35 @@ export default function ContactsScreen() {
         onConfirm={doBulkDelete}
         onCancel={() => setConfirmBulkDelete(false)}
       />
+
+      <AddressBookPickerSheet
+        visible={moveSheetOpen}
+        onClose={() => setMoveSheetOpen(false)}
+        onPick={(id) => { void handleBulkMove(id); }}
+      />
+
+      <TagAssignSheet
+        visible={tagSheetOpen}
+        onClose={() => setTagSheetOpen(false)}
+        onPick={(kw) => { void handleBulkTag(kw); }}
+      />
+
+      <ContactImportSheet
+        visible={importOpen}
+        onClose={() => setImportOpen(false)}
+        targetBookId={importTargetBookId}
+        targetBookName={importTargetName}
+        onChangeTarget={addressBooks.length > 1 ? () => setImportTargetOpen(true) : undefined}
+        onImported={() => { void fetchContacts(); }}
+      />
+
+      <AddressBookPickerSheet
+        visible={importTargetOpen}
+        onClose={() => setImportTargetOpen(false)}
+        currentBookId={importTargetBookId}
+        title="Import into address book"
+        onPick={(id) => { setImportTargetBookId(id); setImportTargetOpen(false); }}
+      />
     </SafeAreaView>
   );
 }
diff --git a/src/screens/EmailListScreen.tsx b/src/screens/EmailListScreen.tsx
index 61b7b781..129c04fb 100644
--- a/src/screens/EmailListScreen.tsx
+++ b/src/screens/EmailListScreen.tsx
@@ -5,6 +5,7 @@ import DateTimePicker, { type DateTimePickerEvent } from '@react-native-communit
 import {
   Search, SquarePen, Menu, Filter, Square, SquareCheck, Minus, X,
   Star, Paperclip, Mail as MailIcon, MailOpen, Trash2, RotateCcw, CalendarDays,
+  Archive, FolderInput, Tag,
 } from 'lucide-react-native';
 import { spacing, radius, typography, componentSizes, type ThemePalette } from '../theme/tokens';
 import { useColors } from '../theme/colors';
@@ -13,11 +14,13 @@ import SidebarDrawer from '../components/SidebarDrawer';
 import SenderAvatar from '../components/SenderAvatar';
 import { SwipeableRow } from '../components/SwipeableRow';
 import { MoveSheet } from '../components/MoveSheet';
+import { TagSheet } from '../components/TagSheet';
 import { UndoSnackbar } from '../components/UndoSnackbar';
 import { OfflineBanner } from '../components/OfflineBanner';
 import { useNetworkStore } from '../stores/network-store';
 import { useEmailStore, type EmailFilters } from '../stores/email-store';
 import { useSettingsStore, type SwipeAction } from '../stores/settings-store';
+import { useKeywordsStore } from '../stores/keywords-store';
 import type { Email } from '../api/types';
 
 function getSenderName(email: Email): string {
@@ -191,6 +194,15 @@ export default function EmailListScreen({ onEmailPress, onComposePress }: EmailL
   const deleteEmailAction = useEmailStore((s) => s.deleteEmail);
   const moveToMailboxAction = useEmailStore((s) => s.moveToMailbox);
   const archiveEmailAction = useEmailStore((s) => s.archiveEmail);
+  const archiveEmailsBatch = useEmailStore((s) => s.archiveEmailsBatch);
+  const moveEmailsToMailbox = useEmailStore((s) => s.moveEmailsToMailbox);
+  const deleteEmailsBatch = useEmailStore((s) => s.deleteEmailsBatch);
+  const setKeywordForEmails = useEmailStore((s) => s.setKeywordForEmails);
+
+  const keywordDefs = useKeywordsStore((s) => s.keywords);
+  const keywordsHydrated = useKeywordsStore((s) => s.hydrated);
+  const hydrateKeywords = useKeywordsStore((s) => s.hydrate);
+  React.useEffect(() => { if (!keywordsHydrated) void hydrateKeywords(); }, [keywordsHydrated, hydrateKeywords]);
 
   const swipeLeftAction = useSettingsStore((s) => s.swipeLeftAction);
   const swipeRightAction = useSettingsStore((s) => s.swipeRightAction);
@@ -240,6 +252,9 @@ export default function EmailListScreen({ onEmailPress, onComposePress }: EmailL
 
   // Move-to-folder picker triggered by the swipe action.
   const [pendingMoveId, setPendingMoveId] = React.useState<string | null>(null);
+  // Batch (multi-select) sheets.
+  const [batchMoveOpen, setBatchMoveOpen] = React.useState(false);
+  const [tagSheetOpen, setTagSheetOpen] = React.useState(false);
 
   // Selection state
   const [selectedIds, setSelectedIds] = React.useState<Set<string>>(new Set());
@@ -385,11 +400,29 @@ export default function EmailListScreen({ onEmailPress, onComposePress }: EmailL
       clearSelection();
       return;
     }
-    const ids = Array.from(selectedIds);
-    await Promise.all(ids.map((id) => deleteEmailAction(id, trash.id, currentMailboxId)));
+    await deleteEmailsBatch(Array.from(selectedIds), trash.id, currentMailboxId);
     clearSelection();
   };
 
+  const handleBulkArchive = async () => {
+    await archiveEmailsBatch(Array.from(selectedIds));
+    clearSelection();
+  };
+
+  const canArchiveSelection =
+    archiveMailboxId != null && currentMailboxId !== archiveMailboxId;
+
+  const handleBatchMovePick = (toId: string) => {
+    const ids = Array.from(selectedIds);
+    setBatchMoveOpen(false);
+    clearSelection();
+    void moveEmailsToMailbox(ids, toId);
+  };
+
+  const handleBatchTagToggle = (token: string, on: boolean) => {
+    void setKeywordForEmails(Array.from(selectedIds), token, on);
+  };
+
   // Local input state for uninterrupted typing; debounce into the store.
   const [searchInput, setSearchInput] = React.useState(storeSearchQuery);
   React.useEffect(() => {
@@ -486,6 +519,29 @@ export default function EmailListScreen({ onEmailPress, onComposePress }: EmailL
               <MailOpen size={20} color={c.text} />
             )}
           </Pressable>
+          <Pressable
+            onPress={() => setTagSheetOpen(true)}
+            style={styles.headerButton}
+            hitSlop={6}
+          >
+            <Tag size={20} color={c.text} />
+          </Pressable>
+          <Pressable
+            onPress={() => setBatchMoveOpen(true)}
+            style={styles.headerButton}
+            hitSlop={6}
+          >
+            <FolderInput size={20} color={c.text} />
+          </Pressable>
+          {canArchiveSelection && (
+            <Pressable
+              onPress={() => { void handleBulkArchive(); }}
+              style={styles.headerButton}
+              hitSlop={6}
+            >
+              <Archive size={20} color={c.text} />
+            </Pressable>
+          )}
           <Pressable
             onPress={() => { void handleBulkDelete(); }}
             style={styles.headerButton}
@@ -891,6 +947,22 @@ export default function EmailListScreen({ onEmailPress, onComposePress }: EmailL
         }}
       />
 
+      <MoveSheet
+        visible={batchMoveOpen}
+        onClose={() => setBatchMoveOpen(false)}
+        mailboxes={mailboxes}
+        currentMailboxId={currentMailboxId}
+        onPick={handleBatchMovePick}
+      />
+
+      <TagSheet
+        visible={tagSheetOpen}
+        onClose={() => setTagSheetOpen(false)}
+        keywords={keywordDefs}
+        selectedEmails={selectedEmails}
+        onToggle={handleBatchTagToggle}
+      />
+
       <UndoSnackbar />
     </SafeAreaView>
   );
diff --git a/src/screens/EmailThreadScreen.tsx b/src/screens/EmailThreadScreen.tsx
index bd228e8a..8e84d8c4 100644
--- a/src/screens/EmailThreadScreen.tsx
+++ b/src/screens/EmailThreadScreen.tsx
@@ -14,6 +14,7 @@ import {
 import { spacing, radius, typography, componentSizes, type ThemePalette } from '../theme/tokens';
 import { useColors } from '../theme/colors';
 import EmailBodyView from '../components/EmailBodyView';
+import { CalendarInvitationBanner } from '../components/email/CalendarInvitationBanner';
 import SenderAvatar from '../components/SenderAvatar';
 import { MoveSheet } from '../components/MoveSheet';
 import { useEmailStore } from '../stores/email-store';
@@ -434,6 +435,9 @@ export default function EmailThreadScreen({ route, navigation }: Props) {
             {/* Attachments chips (full-width below header) */}
             {attachmentPosition === 'below-header' && renderAttachments()}
 
+            {/* Calendar invitation (auto-detected .ics) */}
+            <CalendarInvitationBanner email={email} />
+
             {/* Body */}
             <View style={styles.bodyBlock}>
               <EmailBodyView email={email} senderEmail={from?.email} />
diff --git a/src/screens/ScheduledScreen.tsx b/src/screens/ScheduledScreen.tsx
new file mode 100644
index 00000000..49584e89
--- /dev/null
+++ b/src/screens/ScheduledScreen.tsx
@@ -0,0 +1,196 @@
+import React from 'react';
+import {
+  View, Text, StyleSheet, FlatList, ActivityIndicator, Pressable, Alert,
+} from 'react-native';
+import { SafeAreaView } from 'react-native-safe-area-context';
+import { ArrowLeft, Clock, X } from 'lucide-react-native';
+import type { NativeStackScreenProps } from '@react-navigation/native-stack';
+import type { RootStackParamList } from '../navigation/types';
+import {
+  listScheduledEmails,
+  cancelScheduledSend,
+  type ScheduledEmail,
+} from '../api/email';
+import { spacing, typography, componentSizes, radius, type ThemePalette } from '../theme/tokens';
+import { useColors } from '../theme/colors';
+
+type Props = NativeStackScreenProps<RootStackParamList, 'Scheduled'>;
+
+function recipientLabel(item: ScheduledEmail): string {
+  const first = item.to?.[0];
+  if (!first) return '(no recipient)';
+  const name = first.name || first.email;
+  const extra = (item.to?.length ?? 0) - 1;
+  return extra > 0 ? `${name} +${extra}` : name;
+}
+
+export default function ScheduledScreen({ navigation }: Props) {
+  const c = useColors();
+  const styles = React.useMemo(() => makeStyles(c), [c]);
+  const [items, setItems] = React.useState<ScheduledEmail[]>([]);
+  const [loading, setLoading] = React.useState(true);
+  const [error, setError] = React.useState<string | null>(null);
+  const [cancelling, setCancelling] = React.useState<string | null>(null);
+
+  const load = React.useCallback(async () => {
+    setLoading(true);
+    setError(null);
+    try {
+      setItems(await listScheduledEmails());
+    } catch (e) {
+      setError(e instanceof Error ? e.message : 'Failed to load scheduled messages');
+    } finally {
+      setLoading(false);
+    }
+  }, []);
+
+  React.useEffect(() => {
+    void load();
+  }, [load]);
+
+  const onCancel = (item: ScheduledEmail) => {
+    Alert.alert(
+      'Cancel scheduled send?',
+      'The message will not be delivered. A copy stays in your Sent folder.',
+      [
+        { text: 'Keep scheduled', style: 'cancel' },
+        {
+          text: 'Cancel send',
+          style: 'destructive',
+          onPress: () => {
+            setCancelling(item.emailSubmissionId);
+            void (async () => {
+              try {
+                await cancelScheduledSend(item.emailSubmissionId);
+                setItems((prev) =>
+                  prev.filter((i) => i.emailSubmissionId !== item.emailSubmissionId),
+                );
+              } catch (e) {
+                Alert.alert('Cancel failed', e instanceof Error ? e.message : String(e));
+              } finally {
+                setCancelling(null);
+              }
+            })();
+          },
+        },
+      ],
+    );
+  };
+
+  const renderItem = ({ item }: { item: ScheduledEmail }) => (
+    <View style={styles.row}>
+      <View style={styles.rowMain}>
+        <View style={styles.sendAtRow}>
+          <Clock size={13} color={c.primary} />
+          <Text style={styles.sendAt}>{new Date(item.sendAt).toLocaleString()}</Text>
+        </View>
+        <Text style={styles.subject} numberOfLines={1}>
+          {item.subject || '(no subject)'}
+        </Text>
+        <Text style={styles.recipient} numberOfLines={1}>
+          To: {recipientLabel(item)}
+        </Text>
+        {item.preview ? (
+          <Text style={styles.preview} numberOfLines={1}>{item.preview}</Text>
+        ) : null}
+      </View>
+      <Pressable
+        onPress={() => onCancel(item)}
+        style={styles.cancelBtn}
+        hitSlop={8}
+        disabled={cancelling === item.emailSubmissionId}
+      >
+        {cancelling === item.emailSubmissionId ? (
+          <ActivityIndicator size="small" color={c.error} />
+        ) : (
+          <X size={18} color={c.error} />
+        )}
+      </Pressable>
+    </View>
+  );
+
+  return (
+    <SafeAreaView style={styles.container} edges={['top']}>
+      <View style={styles.header}>
+        <Pressable onPress={() => navigation.goBack()} style={styles.headerBtn} hitSlop={8}>
+          <ArrowLeft size={22} color={c.text} />
+        </Pressable>
+        <Text style={styles.headerTitle} numberOfLines={1}>Scheduled</Text>
+        <View style={styles.headerBtn} />
+      </View>
+
+      {loading ? (
+        <View style={styles.center}>
+          <ActivityIndicator color={c.primary} />
+        </View>
+      ) : error ? (
+        <View style={styles.center}>
+          <Text style={styles.error}>{error}</Text>
+          <Pressable onPress={() => { void load(); }}>
+            <Text style={styles.retry}>Retry</Text>
+          </Pressable>
+        </View>
+      ) : items.length === 0 ? (
+        <View style={styles.center}>
+          <Clock size={40} color={c.textMuted} style={{ opacity: 0.4 }} />
+          <Text style={styles.emptyText}>No scheduled messages</Text>
+          <Text style={styles.emptyHint}>
+            Use the clock icon in the composer to send a message later.
+          </Text>
+        </View>
+      ) : (
+        <FlatList
+          data={items}
+          keyExtractor={(i) => i.emailSubmissionId}
+          renderItem={renderItem}
+          ItemSeparatorComponent={() => <View style={styles.separator} />}
+          contentContainerStyle={styles.listContent}
+          refreshing={loading}
+          onRefresh={() => { void load(); }}
+        />
+      )}
+    </SafeAreaView>
+  );
+}
+
+function makeStyles(c: ThemePalette) {
+  return StyleSheet.create({
+    container: { flex: 1, backgroundColor: c.background },
+    header: {
+      flexDirection: 'row',
+      alignItems: 'center',
+      height: componentSizes.headerHeight,
+      paddingHorizontal: spacing.lg,
+      borderBottomWidth: 1,
+      borderBottomColor: c.border,
+      gap: spacing.sm,
+    },
+    headerBtn: {
+      width: 40, height: 40, alignItems: 'center', justifyContent: 'center', borderRadius: radius.md,
+    },
+    headerTitle: { ...typography.h3, color: c.text, flex: 1 },
+    center: { flex: 1, alignItems: 'center', justifyContent: 'center', gap: spacing.sm, padding: spacing.lg },
+    error: { ...typography.body, color: c.error, textAlign: 'center' },
+    retry: { ...typography.bodyMedium, color: c.primary, marginTop: spacing.sm },
+    emptyText: { ...typography.body, color: c.textSecondary },
+    emptyHint: { ...typography.caption, color: c.textMuted, textAlign: 'center', maxWidth: 280 },
+    listContent: { paddingVertical: spacing.sm },
+    separator: { height: StyleSheet.hairlineWidth, backgroundColor: c.border },
+    row: {
+      flexDirection: 'row',
+      alignItems: 'center',
+      gap: spacing.md,
+      paddingHorizontal: spacing.lg,
+      paddingVertical: spacing.md,
+    },
+    rowMain: { flex: 1, minWidth: 0, gap: 2 },
+    sendAtRow: { flexDirection: 'row', alignItems: 'center', gap: 5 },
+    sendAt: { ...typography.caption, color: c.primary, fontWeight: '600' },
+    subject: { ...typography.bodyMedium, color: c.text },
+    recipient: { ...typography.caption, color: c.textSecondary },
+    preview: { ...typography.caption, color: c.textMuted },
+    cancelBtn: {
+      width: 36, height: 36, alignItems: 'center', justifyContent: 'center', borderRadius: radius.sm,
+    },
+  });
+}
diff --git a/src/screens/UnifiedInboxScreen.tsx b/src/screens/UnifiedInboxScreen.tsx
new file mode 100644
index 00000000..f452e4fa
--- /dev/null
+++ b/src/screens/UnifiedInboxScreen.tsx
@@ -0,0 +1,234 @@
+import React from 'react';
+import {
+  View, Text, StyleSheet, FlatList, ActivityIndicator, Pressable,
+} from 'react-native';
+import { SafeAreaView } from 'react-native-safe-area-context';
+import { ArrowLeft, Star, Paperclip, AlertTriangle } from 'lucide-react-native';
+import type { NativeStackScreenProps } from '@react-navigation/native-stack';
+import type { RootStackParamList } from '../navigation/types';
+import SenderAvatar from '../components/SenderAvatar';
+import { fetchUnifiedInbox, type UnifiedEmail } from '../api/unified-inbox';
+import { useAccountStore } from '../stores/account-store';
+import { useAuthStore } from '../stores/auth-store';
+import { spacing, typography, componentSizes, radius, type ThemePalette } from '../theme/tokens';
+import { useColors } from '../theme/colors';
+
+type Props = NativeStackScreenProps<RootStackParamList, 'UnifiedInbox'>;
+
+function senderName(email: UnifiedEmail): string {
+  return email.from?.[0]?.name || email.from?.[0]?.email || 'Unknown';
+}
+
+function formatRelativeTime(date: Date): string {
+  const diffMin = Math.floor((Date.now() - date.getTime()) / 60000);
+  if (diffMin < 1) return 'now';
+  if (diffMin < 60) return `${diffMin}m`;
+  const diffHr = Math.floor(diffMin / 60);
+  if (diffHr < 24) return `${diffHr}h`;
+  const diffDay = Math.floor(diffHr / 24);
+  if (diffDay < 7) return `${diffDay}d`;
+  return date.toLocaleDateString(undefined, { month: 'short', day: 'numeric' });
+}
+
+export default function UnifiedInboxScreen({ navigation }: Props) {
+  const c = useColors();
+  const styles = React.useMemo(() => makeStyles(c), [c]);
+  const accounts = useAccountStore((s) => s.accounts);
+  const switchAccount = useAuthStore((s) => s.switchAccount);
+
+  const [emails, setEmails] = React.useState<UnifiedEmail[]>([]);
+  const [errors, setErrors] = React.useState<Record<string, string>>({});
+  const [loading, setLoading] = React.useState(true);
+  const [opening, setOpening] = React.useState(false);
+
+  const accountById = React.useMemo(
+    () => new Map(accounts.map((a) => [a.id, a])),
+    [accounts],
+  );
+  const accountIds = React.useMemo(() => accounts.map((a) => a.id), [accounts]);
+
+  const load = React.useCallback(async () => {
+    setLoading(true);
+    try {
+      const result = await fetchUnifiedInbox(accountIds);
+      setEmails(result.emails);
+      setErrors(result.errors);
+    } finally {
+      setLoading(false);
+    }
+  }, [accountIds]);
+
+  React.useEffect(() => {
+    void load();
+  }, [load]);
+
+  const onOpen = React.useCallback(
+    (email: UnifiedEmail) => {
+      if (opening) return;
+      setOpening(true);
+      void (async () => {
+        try {
+          const auth = useAuthStore.getState();
+          if (auth.activeAccountId !== email.sourceAccountId) {
+            await switchAccount(email.sourceAccountId);
+            if (useAuthStore.getState().activeAccountId !== email.sourceAccountId) return;
+          }
+          navigation.navigate('EmailThread', {
+            emailId: email.id,
+            threadId: email.threadId,
+            subject: email.subject,
+          });
+        } finally {
+          setOpening(false);
+        }
+      })();
+    },
+    [opening, switchAccount, navigation],
+  );
+
+  const errorCount = Object.keys(errors).length;
+
+  const renderItem = ({ item }: { item: UnifiedEmail }) => {
+    const acc = accountById.get(item.sourceAccountId);
+    const unread = !item.keywords?.$seen;
+    const starred = !!item.keywords?.$flagged;
+    return (
+      <Pressable
+        onPress={() => onOpen(item)}
+        style={({ pressed }) => [styles.row, pressed && styles.rowPressed]}
+      >
+        <View style={styles.avatarWrap}>
+          <SenderAvatar
+            name={senderName(item)}
+            email={item.from?.[0]?.email}
+            size={componentSizes.avatarMd}
+          />
+          {acc && <View style={[styles.accountDot, { backgroundColor: acc.avatarColor }]} />}
+        </View>
+        <View style={styles.content}>
+          <View style={styles.line}>
+            <Text style={[styles.sender, unread && styles.bold]} numberOfLines={1}>
+              {senderName(item)}
+            </Text>
+            {starred && <Star size={12} color={c.starred} fill={c.starred} />}
+            {item.hasAttachment && <Paperclip size={12} color={c.textMuted} />}
+            <Text style={styles.time}>{formatRelativeTime(new Date(item.receivedAt))}</Text>
+          </View>
+          <Text style={[styles.subject, unread && styles.bold]} numberOfLines={1}>
+            {item.subject || '(no subject)'}
+          </Text>
+          <View style={styles.line}>
+            {acc && (
+              <Text style={styles.account} numberOfLines={1}>
+                {acc.email || acc.username}
+              </Text>
+            )}
+          </View>
+          {item.preview ? (
+            <Text style={styles.preview} numberOfLines={1}>{item.preview}</Text>
+          ) : null}
+        </View>
+      </Pressable>
+    );
+  };
+
+  return (
+    <SafeAreaView style={styles.container} edges={['top']}>
+      <View style={styles.header}>
+        <Pressable onPress={() => navigation.goBack()} style={styles.headerBtn} hitSlop={8}>
+          <ArrowLeft size={22} color={c.text} />
+        </Pressable>
+        <Text style={styles.headerTitle} numberOfLines={1}>All inboxes</Text>
+        <View style={styles.headerBtn}>
+          {opening ? <ActivityIndicator size="small" color={c.primary} /> : null}
+        </View>
+      </View>
+
+      {errorCount > 0 && (
+        <View style={styles.errorBanner}>
+          <AlertTriangle size={14} color={c.error} />
+          <Text style={styles.errorBannerText} numberOfLines={1}>
+            {errorCount === 1
+              ? '1 account could not be loaded'
+              : `${errorCount} accounts could not be loaded`}
+          </Text>
+        </View>
+      )}
+
+      {loading && emails.length === 0 ? (
+        <View style={styles.center}>
+          <ActivityIndicator color={c.primary} />
+          <Text style={styles.loadingText}>Loading all inboxes…</Text>
+        </View>
+      ) : emails.length === 0 ? (
+        <View style={styles.center}>
+          <Text style={styles.loadingText}>No mail across your accounts</Text>
+        </View>
+      ) : (
+        <FlatList
+          data={emails}
+          keyExtractor={(item) => `${item.sourceAccountId}:${item.id}`}
+          renderItem={renderItem}
+          ItemSeparatorComponent={() => <View style={styles.separator} />}
+          refreshing={loading}
+          onRefresh={() => { void load(); }}
+        />
+      )}
+    </SafeAreaView>
+  );
+}
+
+function makeStyles(c: ThemePalette) {
+  return StyleSheet.create({
+    container: { flex: 1, backgroundColor: c.background },
+    header: {
+      flexDirection: 'row',
+      alignItems: 'center',
+      height: componentSizes.headerHeight,
+      paddingHorizontal: spacing.lg,
+      borderBottomWidth: 1,
+      borderBottomColor: c.border,
+      gap: spacing.sm,
+    },
+    headerBtn: {
+      width: 40, height: 40, alignItems: 'center', justifyContent: 'center', borderRadius: radius.md,
+    },
+    headerTitle: { ...typography.h3, color: c.text, flex: 1 },
+    errorBanner: {
+      flexDirection: 'row',
+      alignItems: 'center',
+      gap: spacing.sm,
+      paddingHorizontal: spacing.lg,
+      paddingVertical: spacing.sm,
+      backgroundColor: c.errorBg,
+    },
+    errorBannerText: { ...typography.caption, color: c.error, flex: 1 },
+    center: { flex: 1, alignItems: 'center', justifyContent: 'center', gap: spacing.sm },
+    loadingText: { ...typography.body, color: c.textSecondary },
+    separator: { height: StyleSheet.hairlineWidth, backgroundColor: c.border },
+    row: {
+      flexDirection: 'row',
+      gap: spacing.md,
+      paddingHorizontal: spacing.lg,
+      paddingVertical: spacing.md,
+    },
+    rowPressed: { backgroundColor: c.surfaceHover },
+    avatarWrap: { position: 'relative' },
+    accountDot: {
+      position: 'absolute',
+      right: -2, bottom: -2,
+      width: 12, height: 12,
+      borderRadius: 6,
+      borderWidth: 2,
+      borderColor: c.background,
+    },
+    content: { flex: 1, minWidth: 0, gap: 1 },
+    line: { flexDirection: 'row', alignItems: 'center', gap: 6 },
+    sender: { ...typography.bodyMedium, color: c.text, flex: 1 },
+    bold: { fontWeight: '700' },
+    time: { ...typography.caption, color: c.textMuted },
+    subject: { ...typography.body, color: c.text },
+    account: { ...typography.caption, color: c.textMuted },
+    preview: { ...typography.caption, color: c.textMuted },
+  });
+}
diff --git a/src/stores/__tests__/calendar-store.test.ts b/src/stores/__tests__/calendar-store.test.ts
index f24db0f1..8aa6f537 100644
--- a/src/stores/__tests__/calendar-store.test.ts
+++ b/src/stores/__tests__/calendar-store.test.ts
@@ -272,7 +272,9 @@ describe('calendar-store', () => {
         { title: 'New' } as any,
       );
 
-      expect(mockUpdateEvent).toHaveBeenCalledWith('master', { title: 'New' });
+      // The third arg is the iMIP scheduling flag — undefined here since the
+      // event has no participants to notify.
+      expect(mockUpdateEvent).toHaveBeenCalledWith('master', { title: 'New' }, undefined);
     });
   });
 
diff --git a/src/stores/calendar-store.ts b/src/stores/calendar-store.ts
index 2490cd8d..d7c5f727 100644
--- a/src/stores/calendar-store.ts
+++ b/src/stores/calendar-store.ts
@@ -9,10 +9,19 @@ import {
   createEvent as apiCreateEvent,
   updateEvent as apiUpdateEvent,
   deleteEvents as apiDeleteEvents,
+  batchCreateEvents as apiBatchCreateEvents,
+  rsvpEvent as apiRsvpEvent,
+  createCalendar as apiCreateCalendar,
 } from '../api/calendar';
 import { jmapClient } from '../api/jmap-client';
 import { expandRecurringEvents } from '../lib/recurrence-expansion';
 
+// Does the event carry attendees the server should notify over iMIP? Used to
+// decide whether to set sendSchedulingMessages on create/update/delete.
+function hasSchedulingParticipants(event?: Partial<CalendarEvent> | null): boolean {
+  return !!event?.participants && Object.keys(event.participants).length > 0;
+}
+
 const HIDDEN_CALENDARS_STORAGE_KEY = 'webmail:calendar:hidden:v1';
 
 export interface LoadedRange {
@@ -23,6 +32,7 @@ export interface LoadedRange {
 export interface CalendarState {
   calendars: Calendar[];
   events: CalendarEvent[];
+  tasks: CalendarEvent[];
   hiddenCalendarIds: string[];
   loadedRange: LoadedRange | null;
   loading: boolean;
@@ -38,6 +48,20 @@ export interface CalendarState {
   createEvent: (event: Partial<CalendarEvent>, calendarId: string) => Promise<CalendarEvent>;
   updateEvent: (id: string, changes: Partial<CalendarEvent>) => Promise<void>;
   deleteEvent: (id: string) => Promise<void>;
+  // Invitations / scheduling
+  rsvpEvent: (
+    eventId: string,
+    participantId: string,
+    status: 'accepted' | 'declined' | 'tentative',
+    replyTo?: Record<string, string> | null,
+  ) => Promise<void>;
+  importEvents: (events: Partial<CalendarEvent>[], calendarId: string) => Promise<number>;
+  createCalendar: (name: string, color?: string) => Promise<Calendar>;
+  // Tasks
+  createTask: (task: Partial<CalendarEvent>, calendarId: string) => Promise<void>;
+  updateTask: (id: string, changes: Partial<CalendarEvent>) => Promise<void>;
+  toggleTaskComplete: (id: string) => Promise<void>;
+  deleteTask: (id: string) => Promise<void>;
   toggleCalendarVisibility: (id: string) => void;
   setCalendarHidden: (id: string, hidden: boolean) => void;
   reset: () => void;
@@ -66,6 +90,7 @@ export const useCalendarStore = create<CalendarState>()(
     (set, get) => ({
   calendars: [],
   events: [],
+  tasks: [],
   hiddenCalendarIds: [],
   loadedRange: null,
   loading: false,
@@ -108,14 +133,16 @@ export const useCalendarStore = create<CalendarState>()(
     try {
       const ids = (await queryEvents(calendarIds, after, before)) ?? [];
       const raw = ids.length > 0 ? ((await fetchEvents(ids)) ?? []) : [];
-      // Stalwart returns both Events and Tasks from CalendarEvent/query; tasks
-      // lack `start` and must be filtered out client-side.
+      // Stalwart returns both Events and Tasks from CalendarEvent/query. Events
+      // have a `start`; tasks are surfaced separately so they don't pollute the
+      // grid (they're shown in the task list with their due date instead).
       const onlyEvents = raw.filter((e) => {
         const t = (e as { '@type'?: string })['@type'];
         return (t === 'Event' || t === undefined) && !!e.start;
       });
+      const tasks = raw.filter((e) => (e as { '@type'?: string })['@type'] === 'Task');
       const events = expandRecurringEvents(onlyEvents, after, before);
-      set({ events, loadedRange: { after, before }, loading: false });
+      set({ events, tasks, loadedRange: { after, before }, loading: false });
     } catch (err) {
       set({ loading: false, error: err instanceof Error ? err.message : 'Failed to load events' });
     }
@@ -166,7 +193,11 @@ export const useCalendarStore = create<CalendarState>()(
   },
 
   createEvent: async (event, calendarId) => {
-    const created = await apiCreateEvent(event, calendarId);
+    const created = await apiCreateEvent(
+      event,
+      calendarId,
+      hasSchedulingParticipants(event) ? true : undefined,
+    );
     set({ events: [...get().events, created] });
     return created;
   },
@@ -175,7 +206,11 @@ export const useCalendarStore = create<CalendarState>()(
     // Resolve client-side expanded occurrence IDs back to the master event ID.
     const storeEvent = get().events.find((e) => e.id === id);
     const realId = storeEvent?.originalId || id;
-    await apiUpdateEvent(realId, changes);
+    // Notify attendees if either the stored event or the incoming changes
+    // carry participants.
+    const schedule =
+      hasSchedulingParticipants(changes) || hasSchedulingParticipants(storeEvent);
+    await apiUpdateEvent(realId, changes, schedule ? true : undefined);
     set({
       events: get().events.map((e) => (e.id === id ? { ...e, ...changes } : e)),
     });
@@ -184,10 +219,89 @@ export const useCalendarStore = create<CalendarState>()(
   deleteEvent: async (id) => {
     const storeEvent = get().events.find((e) => e.id === id);
     const realId = storeEvent?.originalId || id;
-    await apiDeleteEvents([realId]);
+    await apiDeleteEvents(
+      [realId],
+      hasSchedulingParticipants(storeEvent) ? true : undefined,
+    );
     set({ events: get().events.filter((e) => e.id !== id) });
   },
 
+  rsvpEvent: async (eventId, participantId, status, replyTo) => {
+    if (!participantId || participantId.includes('..')) {
+      throw new Error('Invalid participant ID');
+    }
+    const storeEvent = get().events.find((e) => e.id === eventId);
+    const realId = storeEvent?.originalId || eventId;
+    await apiRsvpEvent(realId, participantId, status, replyTo);
+    set({
+      events: get().events.map((e) => {
+        if (e.id !== eventId || !e.participants?.[participantId]) return e;
+        return {
+          ...e,
+          participants: {
+            ...e.participants,
+            [participantId]: { ...e.participants[participantId], participationStatus: status },
+          },
+        };
+      }),
+    });
+  },
+
+  importEvents: async (events, calendarId) => {
+    if (events.length === 0) return 0;
+    // Stalwart enforces UID uniqueness across calendars. Skip events whose UID
+    // already exists; create the rest. (We don't attempt cross-calendar linking
+    // on mobile — a duplicate is simply skipped.)
+    let toCreate = events;
+    try {
+      const existingIds = await queryEvents([], '', '');
+      const existing = existingIds.length > 0 ? await fetchEvents(existingIds) : [];
+      const seenUids = new Set(existing.map((e) => e.uid).filter(Boolean) as string[]);
+      toCreate = events.filter((e) => !e.uid || !seenUids.has(e.uid));
+    } catch {
+      // Couldn't dedupe — proceed and let the server reject genuine dupes.
+    }
+    if (toCreate.length === 0) return 0;
+    const count = await apiBatchCreateEvents(toCreate, calendarId);
+    await get().refresh();
+    return count;
+  },
+
+  createCalendar: async (name, color) => {
+    const created = await apiCreateCalendar(name, color);
+    set({ calendars: [...get().calendars, created] });
+    return created;
+  },
+
+  createTask: async (task, calendarId) => {
+    await apiCreateEvent({ ...task, '@type': 'Task' }, calendarId);
+    await get().refresh();
+  },
+
+  updateTask: async (id, changes) => {
+    const task = get().tasks.find((t) => t.id === id);
+    const realId = task?.originalId || id;
+    await apiUpdateEvent(realId, changes);
+    set({ tasks: get().tasks.map((t) => (t.id === id ? { ...t, ...changes } : t)) });
+  },
+
+  toggleTaskComplete: async (id) => {
+    const task = get().tasks.find((t) => t.id === id);
+    if (!task) return;
+    const completed = task.progress === 'completed';
+    const next: Partial<CalendarEvent> = completed
+      ? { progress: 'in-process', percentComplete: 0 }
+      : { progress: 'completed', percentComplete: 100 };
+    await get().updateTask(id, next);
+  },
+
+  deleteTask: async (id) => {
+    const task = get().tasks.find((t) => t.id === id);
+    const realId = task?.originalId || id;
+    await apiDeleteEvents([realId]);
+    set({ tasks: get().tasks.filter((t) => t.id !== id) });
+  },
+
   toggleCalendarVisibility: (id) => {
     const { hiddenCalendarIds } = get();
     const next = hiddenCalendarIds.includes(id)
@@ -211,6 +325,7 @@ export const useCalendarStore = create<CalendarState>()(
   reset: () => set({
     calendars: [],
     events: [],
+    tasks: [],
     loadedRange: null,
     loading: false,
     error: null,
@@ -225,6 +340,7 @@ export const useCalendarStore = create<CalendarState>()(
       partialize: (state) => ({
         calendars: state.calendars,
         events: state.events,
+        tasks: state.tasks,
         loadedRange: state.loadedRange,
       }),
     },
diff --git a/src/stores/calendar-subscriptions-store.ts b/src/stores/calendar-subscriptions-store.ts
new file mode 100644
index 00000000..2481b1dc
--- /dev/null
+++ b/src/stores/calendar-subscriptions-store.ts
@@ -0,0 +1,168 @@
+import { create } from 'zustand';
+import { persist, createJSONStorage } from 'zustand/middleware';
+import AsyncStorage from '@react-native-async-storage/async-storage';
+import type { CalendarEvent } from '../api/types';
+import {
+  createCalendar,
+  deleteCalendar,
+  parseCalendarBlob,
+  queryEvents,
+  getEvents,
+  deleteEvents,
+} from '../api/calendar';
+import { uploadBytes } from '../api/blob';
+import { useCalendarStore } from './calendar-store';
+
+export interface CalendarSubscription {
+  id: string;
+  name: string;
+  url: string;
+  color?: string;
+  /** The local Stalwart calendar that mirrors this remote feed. */
+  calendarId: string;
+  lastSyncAt: number | null;
+  lastError: string | null;
+}
+
+interface SubscriptionsState {
+  subscriptions: CalendarSubscription[];
+  syncing: Record<string, boolean>;
+
+  addSubscription: (input: { name: string; url: string; color?: string }) => Promise<CalendarSubscription>;
+  removeSubscription: (id: string) => Promise<void>;
+  syncSubscription: (id: string) => Promise<void>;
+  syncAll: () => Promise<void>;
+}
+
+// webcal:// is just iCalendar over HTTP(S) — browsers/clients map it to https.
+function normalizeFeedUrl(url: string): string {
+  return url.trim().replace(/^webcal:\/\//i, 'https://');
+}
+
+async function fetchAndParseFeed(url: string): Promise<Partial<CalendarEvent>[]> {
+  const res = await fetch(normalizeFeedUrl(url));
+  if (!res.ok) throw new Error(`Could not fetch feed (HTTP ${res.status})`);
+  const text = await res.text();
+  if (!/BEGIN:VCALENDAR/i.test(text)) {
+    throw new Error('That URL did not return an iCalendar feed');
+  }
+  const bytes = new TextEncoder().encode(text);
+  const { blobId } = await uploadBytes(bytes, 'text/calendar');
+  const events = await parseCalendarBlob(blobId);
+  return events.filter((e) => !!e.start);
+}
+
+// Reconcile the local calendar with the remote feed: delete events whose UID
+// disappeared upstream, then import the current set (importEvents dedupes by
+// UID, so unchanged events are left in place).
+async function syncFeedIntoCalendar(calendarId: string, url: string): Promise<void> {
+  const parsed = await fetchAndParseFeed(url);
+  const parsedUids = new Set(parsed.map((e) => e.uid).filter(Boolean) as string[]);
+
+  try {
+    const allIds = await queryEvents([], '', '');
+    const all = allIds.length > 0 ? await getEvents(allIds) : [];
+    const stale = all
+      .filter((e) => e.calendarIds?.[calendarId] && e.uid && !parsedUids.has(e.uid))
+      .map((e) => e.id);
+    if (stale.length > 0) await deleteEvents(stale);
+  } catch {
+    // Non-fatal: if we can't enumerate existing events, still import new ones.
+  }
+
+  await useCalendarStore.getState().importEvents(parsed, calendarId);
+}
+
+export const useCalendarSubscriptionsStore = create<SubscriptionsState>()(
+  persist(
+    (set, get) => ({
+      subscriptions: [],
+      syncing: {},
+
+      addSubscription: async ({ name, url, color }) => {
+        // Create a dedicated local calendar to hold the feed's events.
+        const calendar = await createCalendar(name, color);
+        const sub: CalendarSubscription = {
+          id: `sub-${Date.now().toString(36)}-${Math.random().toString(36).slice(2, 7)}`,
+          name,
+          url: url.trim(),
+          color,
+          calendarId: calendar.id,
+          lastSyncAt: null,
+          lastError: null,
+        };
+        set({ subscriptions: [...get().subscriptions, sub] });
+        // Make the new calendar visible immediately.
+        await useCalendarStore.getState().fetchCalendars();
+        try {
+          set({ syncing: { ...get().syncing, [sub.id]: true } });
+          await syncFeedIntoCalendar(sub.calendarId, sub.url);
+          set({
+            subscriptions: get().subscriptions.map((s) =>
+              s.id === sub.id ? { ...s, lastSyncAt: Date.now(), lastError: null } : s,
+            ),
+          });
+        } catch (err) {
+          const message = err instanceof Error ? err.message : 'Sync failed';
+          set({
+            subscriptions: get().subscriptions.map((s) =>
+              s.id === sub.id ? { ...s, lastError: message } : s,
+            ),
+          });
+        } finally {
+          set({ syncing: { ...get().syncing, [sub.id]: false } });
+        }
+        return sub;
+      },
+
+      removeSubscription: async (id) => {
+        const sub = get().subscriptions.find((s) => s.id === id);
+        set({ subscriptions: get().subscriptions.filter((s) => s.id !== id) });
+        if (sub) {
+          try {
+            await deleteCalendar(sub.calendarId);
+          } catch {
+            // best-effort
+          }
+          await useCalendarStore.getState().fetchCalendars();
+          await useCalendarStore.getState().refresh();
+        }
+      },
+
+      syncSubscription: async (id) => {
+        const sub = get().subscriptions.find((s) => s.id === id);
+        if (!sub) return;
+        set({ syncing: { ...get().syncing, [id]: true } });
+        try {
+          await syncFeedIntoCalendar(sub.calendarId, sub.url);
+          set({
+            subscriptions: get().subscriptions.map((s) =>
+              s.id === id ? { ...s, lastSyncAt: Date.now(), lastError: null } : s,
+            ),
+          });
+        } catch (err) {
+          const message = err instanceof Error ? err.message : 'Sync failed';
+          set({
+            subscriptions: get().subscriptions.map((s) =>
+              s.id === id ? { ...s, lastError: message } : s,
+            ),
+          });
+        } finally {
+          set({ syncing: { ...get().syncing, [id]: false } });
+        }
+      },
+
+      syncAll: async () => {
+        const subs = get().subscriptions;
+        for (const sub of subs) {
+          await get().syncSubscription(sub.id);
+        }
+      },
+    }),
+    {
+      name: 'calendar-subscriptions',
+      storage: createJSONStorage(() => AsyncStorage),
+      partialize: (state) => ({ subscriptions: state.subscriptions }),
+    },
+  ),
+);
diff --git a/src/stores/contacts-store.ts b/src/stores/contacts-store.ts
index 47f72438..deffb134 100644
--- a/src/stores/contacts-store.ts
+++ b/src/stores/contacts-store.ts
@@ -9,6 +9,10 @@ import {
   createContact as apiCreateContact,
   updateContact as apiUpdateContact,
   deleteContacts as apiDeleteContacts,
+  createAddressBook as apiCreateAddressBook,
+  updateAddressBook as apiUpdateAddressBook,
+  deleteAddressBook as apiDeleteAddressBook,
+  getContactsInBook,
 } from '../api/contacts';
 import { jmapClient } from '../api/jmap-client';
 import {
@@ -20,6 +24,10 @@ import {
 
 const SELECTED_CATEGORY_STORAGE_KEY = 'webmail:contacts:category:v1';
 
+// Dedicated JMAP address book that backs the "trusted senders" allow-list.
+// Mirrors the webmail so the same book is shared across clients.
+export const TRUSTED_SENDERS_BOOK_NAME = 'Trusted Senders';
+
 export type ContactCategory =
   | { type: 'all' }
   | { type: 'addressBook'; addressBookId: string }
@@ -35,6 +43,13 @@ export interface ContactsState {
   error: string | null;
   hydrated: boolean;
 
+  // Trusted senders are stored as contacts in a dedicated JMAP address book so
+  // the allow-list syncs across devices (matches the webmail behavior).
+  trustedSendersBookId: string | null;
+  trustedSenderEmails: string[];
+  trustedSendersLoaded: boolean;
+  trustedSendersLoading: boolean;
+
   hydrate: () => Promise<void>;
   fetchAddressBooks: () => Promise<void>;
   fetchContacts: (filter?: { text?: string; inAddressBook?: string }) => Promise<void>;
@@ -45,11 +60,25 @@ export interface ContactsState {
   updateContact: (id: string, changes: Partial<ContactCard>) => Promise<void>;
   deleteContact: (id: string) => Promise<void>;
   bulkDelete: (ids: string[]) => Promise<void>;
+  importContacts: (contacts: Partial<ContactCard>[], addressBookId: string) => Promise<number>;
 
   addContactKeyword: (id: string, keyword: string) => Promise<void>;
   removeContactKeyword: (id: string, keyword: string) => Promise<void>;
+  addKeywordToContacts: (ids: string[], keyword: string) => Promise<void>;
   moveContactsToAddressBook: (ids: string[], addressBookId: string) => Promise<void>;
 
+  // Address book management
+  createAddressBook: (name: string) => Promise<AddressBook>;
+  renameAddressBook: (id: string, name: string) => Promise<void>;
+  deleteAddressBook: (id: string) => Promise<void>;
+
+  // Trusted senders address book. Passive loads (createIfMissing=false) only
+  // read an existing book; the book is created lazily on the first add.
+  loadTrustedSendersBook: (createIfMissing?: boolean) => Promise<void>;
+  addToTrustedSendersBook: (email: string) => Promise<void>;
+  removeFromTrustedSendersBook: (email: string) => Promise<void>;
+  isTrustedAddressBookSender: (email: string) => boolean;
+
   setSelectedCategory: (category: ContactCategory) => void;
   reset: () => void;
 }
@@ -70,6 +99,11 @@ export const useContactsStore = create<ContactsState>()(
   error: null,
   hydrated: false,
 
+  trustedSendersBookId: null,
+  trustedSenderEmails: [],
+  trustedSendersLoaded: false,
+  trustedSendersLoading: false,
+
   hydrate: async () => {
     if (get().hydrated) return;
     try {
@@ -160,6 +194,22 @@ export const useContactsStore = create<ContactsState>()(
     set({ contacts: get().contacts.filter((c) => !idSet.has(c.id)) });
   },
 
+  importContacts: async (incoming, addressBookId) => {
+    let imported = 0;
+    for (const contact of incoming) {
+      try {
+        // Strip the temporary client-side id; the server assigns a real one.
+        const { id: _id, addressBookIds: _abIds, ...data } = contact;
+        const created = await apiCreateContact(data, addressBookId);
+        set({ contacts: [...get().contacts, created] });
+        imported++;
+      } catch (err) {
+        console.warn('[contacts-store] import failed for one contact', err);
+      }
+    }
+    return imported;
+  },
+
   addContactKeyword: async (id, keyword) => {
     const kw = keyword.trim();
     if (!kw) return;
@@ -176,12 +226,115 @@ export const useContactsStore = create<ContactsState>()(
     await get().updateContact(id, { keywords: rest });
   },
 
+  addKeywordToContacts: async (ids, keyword) => {
+    const kw = keyword.trim();
+    if (!kw) return;
+    for (const id of ids) {
+      await get().addContactKeyword(id, kw);
+    }
+  },
+
   moveContactsToAddressBook: async (ids, addressBookId) => {
     for (const id of ids) {
       await get().updateContact(id, { addressBookIds: { [addressBookId]: true } });
     }
   },
 
+  createAddressBook: async (name) => {
+    const trimmed = name.trim();
+    if (!trimmed) throw new Error('Address book name is required');
+    const book = await apiCreateAddressBook(trimmed);
+    set({ addressBooks: [...get().addressBooks, book] });
+    return book;
+  },
+
+  renameAddressBook: async (id, name) => {
+    const trimmed = name.trim();
+    if (!trimmed) return;
+    await apiUpdateAddressBook(id, { name: trimmed });
+    set({
+      addressBooks: get().addressBooks.map((b) => (b.id === id ? { ...b, name: trimmed } : b)),
+    });
+  },
+
+  deleteAddressBook: async (id) => {
+    await apiDeleteAddressBook(id);
+    set({
+      addressBooks: get().addressBooks.filter((b) => b.id !== id),
+      // Drop the deleted book id from any cached contact so the UI doesn't
+      // keep filtering against a book that no longer exists.
+      contacts: get().contacts.map((c) => {
+        if (!c.addressBookIds?.[id]) return c;
+        const { [id]: _gone, ...rest } = c.addressBookIds;
+        return { ...c, addressBookIds: rest };
+      }),
+    });
+    const category = get().selectedCategory;
+    if (category.type === 'addressBook' && category.addressBookId === id) {
+      get().setSelectedCategory({ type: 'all' });
+    }
+  },
+
+  loadTrustedSendersBook: async (createIfMissing = false) => {
+    if (!jmapClient.isConnected || get().trustedSendersLoading) return;
+    set({ trustedSendersLoading: true });
+    try {
+      const books = (await fetchAddressBooks()) ?? [];
+      let book = books.find((b) => b.name === TRUSTED_SENDERS_BOOK_NAME);
+      if (!book) {
+        if (!createIfMissing) {
+          set({ trustedSendersLoaded: true, trustedSendersLoading: false });
+          return;
+        }
+        book = await apiCreateAddressBook(TRUSTED_SENDERS_BOOK_NAME);
+      }
+      const bookId = book.id;
+      const cards = await getContactsInBook(bookId);
+      const emails = cards.flatMap((c) =>
+        c.emails ? Object.values(c.emails).map((e) => e.address.toLowerCase().trim()) : [],
+      ).filter(Boolean);
+      set({
+        trustedSendersBookId: bookId,
+        trustedSenderEmails: emails,
+        trustedSendersLoaded: true,
+        trustedSendersLoading: false,
+      });
+    } catch (err) {
+      console.warn('[contacts-store] load trusted senders failed', err);
+      set({ trustedSendersLoaded: true, trustedSendersLoading: false });
+    }
+  },
+
+  addToTrustedSendersBook: async (email) => {
+    const normalized = email.toLowerCase().trim();
+    if (!normalized || get().trustedSenderEmails.includes(normalized)) return;
+
+    let bookId = get().trustedSendersBookId;
+    if (!bookId) {
+      await get().loadTrustedSendersBook(true);
+      bookId = get().trustedSendersBookId;
+    }
+    if (!bookId) throw new Error('Could not find or create the trusted senders address book');
+
+    await apiCreateContact({ emails: { email: { address: normalized } } }, bookId);
+    set({ trustedSenderEmails: [...get().trustedSenderEmails, normalized] });
+  },
+
+  removeFromTrustedSendersBook: async (email) => {
+    const normalized = email.toLowerCase().trim();
+    const bookId = get().trustedSendersBookId;
+    if (!bookId) return;
+    const cards = await getContactsInBook(bookId);
+    const match = cards.find((c) =>
+      c.emails && Object.values(c.emails).some((e) => e.address.toLowerCase().trim() === normalized),
+    );
+    if (match) await apiDeleteContacts([match.id]);
+    set({ trustedSenderEmails: get().trustedSenderEmails.filter((e) => e !== normalized) });
+  },
+
+  isTrustedAddressBookSender: (email) =>
+    get().trustedSenderEmails.includes(email.toLowerCase().trim()),
+
   setSelectedCategory: (category) => {
     set({ selectedCategory: category });
     persistCategory(category);
@@ -193,6 +346,10 @@ export const useContactsStore = create<ContactsState>()(
     selectedCategory: { type: 'all' },
     loading: false,
     error: null,
+    trustedSendersBookId: null,
+    trustedSenderEmails: [],
+    trustedSendersLoaded: false,
+    trustedSendersLoading: false,
   }),
     }),
     {
diff --git a/src/stores/email-store.ts b/src/stores/email-store.ts
index 6a912010..528818ec 100644
--- a/src/stores/email-store.ts
+++ b/src/stores/email-store.ts
@@ -15,9 +15,12 @@ import {
   getEmailChanges,
   getFullEmail,
   setEmailKeywords,
+  setKeywordsForEmails,
   moveEmail,
+  moveEmails as apiMoveEmails,
   archiveEmails as apiArchiveEmails,
   deleteEmail as apiDeleteEmail,
+  deleteEmails as apiDeleteEmails,
   restoreEmailMailboxes,
   searchEmails as apiSearchEmails,
 } from '../api/email';
@@ -130,6 +133,11 @@ export interface EmailState {
   moveToMailbox: (emailId: string, fromMailboxId: string, toMailboxId: string) => Promise<void>;
   archiveEmail: (emailId: string) => Promise<void>;
   deleteEmail: (emailId: string, trashMailboxId: string, currentMailboxId: string) => Promise<void>;
+  // ── Batch (multi-select) actions ──────────────────────────────
+  archiveEmailsBatch: (emailIds: string[]) => Promise<void>;
+  moveEmailsToMailbox: (emailIds: string[], toMailboxId: string) => Promise<void>;
+  deleteEmailsBatch: (emailIds: string[], trashMailboxId: string, currentMailboxId: string) => Promise<void>;
+  setKeywordForEmails: (emailIds: string[], token: string, on: boolean) => Promise<void>;
   undoLast: () => Promise<void>;
   clearUndo: () => void;
   searchEmails: (query: string) => Promise<Email[]>;
@@ -957,6 +965,133 @@ export const useEmailStore = create<EmailState>()(
     }
   },
 
+  // ── Batch actions ─────────────────────────────────────────────
+  // Each produces a single combined UndoEntry (UndoEntry.items is an array),
+  // so a multi-select archive/move/delete is reversed with one snackbar tap.
+
+  archiveEmailsBatch: async (emailIds) => {
+    const { emails, mailboxes } = get();
+    const archiveMailbox = mailboxes.find(
+      (m) => m.role === 'archive' || m.name.toLowerCase() === 'archive',
+    );
+    if (!archiveMailbox) return;
+    const targets = emails.filter(
+      (e) => emailIds.includes(e.id) && !e.mailboxIds?.[archiveMailbox.id],
+    );
+    if (targets.length === 0) return;
+
+    const mode = useSettingsStore.getState().archiveMode;
+    const items = targets.map((e) => ({ email: e, originalMailboxIds: { ...e.mailboxIds } }));
+
+    await apiArchiveEmails(
+      targets.map((e) => ({ id: e.id, receivedAt: e.receivedAt })),
+      archiveMailbox.id,
+      mode,
+      mailboxes,
+    );
+
+    const removed = new Set(targets.map((e) => e.id));
+    set({
+      emails: get().emails.filter((e) => !removed.has(e.id)),
+      pendingUndo: {
+        kind: 'archive',
+        label: targets.length === 1 ? 'Email archived' : `${targets.length} emails archived`,
+        createdAt: Date.now(),
+        items,
+      },
+    });
+
+    if (mode !== 'single') void get().fetchMailboxes();
+  },
+
+  moveEmailsToMailbox: async (emailIds, toMailboxId) => {
+    const { emails, currentMailboxId, mailboxes } = get();
+    if (!currentMailboxId || toMailboxId === currentMailboxId) return;
+    const targets = emails.filter((e) => emailIds.includes(e.id));
+    if (targets.length === 0) return;
+
+    const items = targets.map((e) => ({ email: e, originalMailboxIds: { ...e.mailboxIds } }));
+
+    await apiMoveEmails(targets.map((e) => e.id), currentMailboxId, toMailboxId);
+
+    const removed = new Set(targets.map((e) => e.id));
+    const targetName = mailboxes.find((m) => m.id === toMailboxId)?.name;
+    set({
+      emails: get().emails.filter((e) => !removed.has(e.id)),
+      pendingUndo: {
+        kind: 'move',
+        label: targetName
+          ? `${targets.length === 1 ? 'Email' : `${targets.length} emails`} moved to ${targetName}`
+          : 'Emails moved',
+        createdAt: Date.now(),
+        items,
+      },
+    });
+  },
+
+  deleteEmailsBatch: async (emailIds, trashMailboxId, currentMailboxId) => {
+    const { emails, mailboxes } = get();
+    const settings = useSettingsStore.getState();
+    const junkMailbox = mailboxes.find((m) => m.role === 'junk' || m.role === 'spam');
+    const inTrash = currentMailboxId === trashMailboxId;
+    const targets = emails.filter((e) => emailIds.includes(e.id));
+    if (targets.length === 0) return;
+
+    // Split into permanent-destroy vs move-to-trash following the same policy
+    // as the single delete: trash folder, global "permanent" default, or the
+    // skip-trash-for-junk option each force a destroy.
+    const toDestroy: Email[] = [];
+    const toTrash: Email[] = [];
+    for (const e of targets) {
+      const inJunk = !!(junkMailbox && e.mailboxIds?.[junkMailbox.id]);
+      const destroy =
+        inTrash ||
+        settings.deleteAction === 'permanent' ||
+        (settings.permanentlyDeleteJunk && inJunk);
+      (destroy ? toDestroy : toTrash).push(e);
+    }
+
+    if (toDestroy.length > 0) {
+      await apiDeleteEmails(toDestroy.map((e) => e.id), trashMailboxId, trashMailboxId);
+    }
+    if (toTrash.length > 0) {
+      await apiMoveEmails(toTrash.map((e) => e.id), currentMailboxId, trashMailboxId);
+    }
+
+    const removed = new Set(targets.map((e) => e.id));
+    set({ emails: get().emails.filter((e) => !removed.has(e.id)) });
+
+    // Only the moved-to-trash items are recoverable; destroyed ones are gone.
+    if (toTrash.length > 0) {
+      set({
+        pendingUndo: {
+          kind: 'delete',
+          label: toTrash.length === 1 ? 'Email moved to Trash' : `${toTrash.length} emails moved to Trash`,
+          createdAt: Date.now(),
+          items: toTrash.map((e) => ({ email: e, originalMailboxIds: { ...e.mailboxIds } })),
+        },
+      });
+    }
+  },
+
+  setKeywordForEmails: async (emailIds, token, on) => {
+    const targets = get().emails.filter((e) => emailIds.includes(e.id));
+    if (targets.length === 0) return;
+    const updates = targets.map((e) => {
+      const keywords = { ...e.keywords };
+      if (on) keywords[token] = true;
+      else delete keywords[token];
+      return { id: e.id, keywords };
+    });
+    await setKeywordsForEmails(updates);
+    const byId = new Map(updates.map((u) => [u.id, u.keywords]));
+    set({
+      emails: get().emails.map((e) =>
+        byId.has(e.id) ? { ...e, keywords: byId.get(e.id)! } : e,
+      ),
+    });
+  },
+
   undoLast: async () => {
     const entry = get().pendingUndo;
     if (!entry) return;
diff --git a/src/stores/settings-store.ts b/src/stores/settings-store.ts
index 1df677ec..e73bd488 100644
--- a/src/stores/settings-store.ts
+++ b/src/stores/settings-store.ts
@@ -68,6 +68,9 @@ interface PersistedSettings {
   attachmentReminderEnabled: boolean;
   attachmentReminderKeywords: string[];
   plainTextMode: boolean;
+  // Undo-send window: every send is deferred by this many seconds (via the
+  // server's FUTURERELEASE support) so it can be cancelled. 0 = send instantly.
+  sendDelaySeconds: number;
 
   // Reading
   markAsReadDelay: number;
@@ -161,6 +164,7 @@ const DEFAULT_PERSISTED: PersistedSettings = {
   attachmentReminderEnabled: true,
   attachmentReminderKeywords: ['attached', 'attachment', 'attaching', 'enclosed'],
   plainTextMode: false,
+  sendDelaySeconds: 0,
 
   markAsReadDelay: 0,
   deleteAction: 'trash',