diff --git a/protos/rustmailer.proto b/protos/rustmailer.proto
index 018277b..2f79349 100644
--- a/protos/rustmailer.proto
+++ b/protos/rustmailer.proto
@@ -533,7 +533,7 @@ message CreateMailboxRequest {
   /// Only applicable for **Graph API** accounts.  
   /// For IMAP or Gmail API accounts, this field is always `None`.  
   /// The ID can be retrieved via the **`/list-mailboxes?remote=true`** endpoint.
-  optional uint64 parent_id = 3;
+  optional string parent_name = 3;
   // Optional color settings for the label (Gmail API only).
   // Only applicable to Gmail API accounts. See [`LabelColor`] for the allowed
   // `text_color` and `background_color` values.
diff --git a/src/modules/cache/vendor/outlook/sync/client.rs b/src/modules/cache/vendor/outlook/sync/client.rs
index 5532352..bff7c19 100644
--- a/src/modules/cache/vendor/outlook/sync/client.rs
+++ b/src/modules/cache/vendor/outlook/sync/client.rs
@@ -10,7 +10,6 @@ use crate::{
         error::{code::ErrorCode, RustMailerResult},
         message::append::ReplyDraft,
         oauth2::token::OAuth2AccessToken,
-        utils::mailbox_id,
     },
     raise_error,
 };
@@ -389,7 +388,7 @@ impl OutlookClient {
     pub async fn create_folder(
         account_id: u64,
         use_proxy: Option<u64>,
-        parent_id: Option<u64>,
+        parent_name: Option<String>,
         folder_name: &str,
     ) -> RustMailerResult<()> {
         let client = HttpClient::new(use_proxy).await?;
@@ -397,20 +396,19 @@ impl OutlookClient {
         let mut url = "https://graph.microsoft.com/v1.0/me/mailFolders".to_string();
         let body = json!({ "displayName": folder_name });
 
-        if let Some(parent_id) = parent_id {
+        if let Some(parent_name) = parent_name {
             let mailboxes = Self::list_mailfolders(account_id, use_proxy).await?;
             if let Some(parent) = mailboxes
                 .into_iter()
-                .find(|m| mailbox_id(account_id, &m.id) == parent_id)
+                .find(|m| m.display_name == parent_name)
             {
-                // parent.id 是 Graph API 的 folder id（字符串），将请求发到父文件夹的 childFolders 端点
                 url = format!(
                     "https://graph.microsoft.com/v1.0/me/mailFolders/{}/childFolders",
                     parent.id
                 );
             } else {
                 return Err(raise_error!(
-                    format!("Parent folder not found: {}", parent_id),
+                    format!("Parent folder not found: {}", parent_name),
                     ErrorCode::InternalError
                 ));
             }
diff --git a/src/modules/grpc/service/mailbox/from.rs b/src/modules/grpc/service/mailbox/from.rs
index d905b55..8c25aea 100644
--- a/src/modules/grpc/service/mailbox/from.rs
+++ b/src/modules/grpc/service/mailbox/from.rs
@@ -95,7 +95,7 @@ impl From<rustmailer_grpc::CreateMailboxRequest> for CreateMailboxRequest {
     fn from(value: rustmailer_grpc::CreateMailboxRequest) -> Self {
         Self {
             mailbox_name: value.mailbox_name,
-            parent_id: value.parent_id,
+            parent_name: value.parent_name,
             label_color: value.label_color.map(|c| c.into()),
         }
     }
diff --git a/src/modules/mailbox/create.rs b/src/modules/mailbox/create.rs
index 0159082..acecc0f 100644
--- a/src/modules/mailbox/create.rs
+++ b/src/modules/mailbox/create.rs
@@ -72,8 +72,8 @@ pub struct CreateMailboxRequest {
     ///
     /// Only applicable for **Graph API** accounts.  
     /// For IMAP or Gmail API accounts, this field is always `None`.  
-    /// The ID can be retrieved via the **`/list-mailboxes?remote=true`** endpoint.
-    pub parent_id: Option<u64>,
+    /// The name can be retrieved via the **`/list-mailboxes?remote=true`** endpoint.
+    pub parent_name: Option<String>,
     /// Optional color settings for the label (Gmail API only).
     ///
     /// Only applicable to Gmail API accounts. See [`LabelColor`] for the allowed
@@ -101,7 +101,7 @@ pub async fn create_mailbox(
             OutlookClient::create_folder(
                 account_id,
                 account.use_proxy,
-                request.parent_id,
+                request.parent_name.clone(),
                 &request.mailbox_name,
             )
             .await