Outlook Mobile Syncs Mail but Not Calendar: Fix

You can receive new emails on your Outlook mobile app, but your calendar events refuse to update or appear blank. This split behavior usually points to a partial sync configuration or a permission restriction on the calendar folder. This article explains why the calendar stops syncing while mail continues, and provides the exact steps to restore full calendar sync on Android and iOS.

Three main causes account for this problem: the account was added with a limited sync scope, the calendar folder is excluded from the sync settings, or the app’s background data permission is restricted. Each cause has a specific fix that does not require reinstalling the app or removing your account. You will learn how to verify your sync settings, adjust folder-level options, and check system permissions.

The fixes in this article apply to the Outlook mobile app for Android and iOS. The same steps work for Microsoft 365 work accounts, Outlook.com, and Gmail accounts added to the Outlook app.

Why the Calendar Stops Syncing While Mail Continues

The Outlook mobile app uses separate sync pipelines for mail, calendar, and contacts. When mail syncs correctly but calendar does not, the issue is almost always in the app-level or system-level permission layer for calendar data. The app may have full access to the mail folder but partial or no access to the calendar folder.

On Android, the Outlook app requests permission to read and write calendar data from the device’s account manager. If this permission is denied or revoked after an OS update, the app can still fetch mail through its own server connection but cannot touch the local calendar store. On iOS, the app relies on the system’s CalDAV or Exchange ActiveSync protocol for calendar data. A misconfigured sync profile or a server-side folder hierarchy change can break the calendar channel while leaving mail intact.

Another common cause is the account being added with a limited sync scope. When you add an account to the Outlook mobile app, you can choose to sync only mail. If you selected Mail only during setup, the calendar folder never gets registered for sync. The fix is to adjust the sync settings inside the app rather than removing and re-adding the account.

Server-Side Folder Hierarchy Changes

If your Exchange or Microsoft 365 administrator moved the calendar folder to a different mailbox or renamed the default calendar, the Outlook mobile app may lose the folder path. The app continues to sync the Inbox because the mail folder path remains valid, but the calendar folder becomes unreachable. In this scenario, removing and re-adding the account forces the app to re-discover all folder paths.

Steps to Restore Calendar Sync on Android

1. Open Outlook and go to Settings
   Tap your profile picture or the menu icon in the top-left corner. Tap the gear icon at the bottom of the menu to open Settings.
2. Tap the account that is missing calendar sync
   Under the Mail Accounts section, tap the email address that shows the problem. Do not tap the Add Account button.
3. Tap Sync Settings
   Scroll down to the Sync Settings section. Tap Sync Settings to open the sync options for this account.
4. Turn on the Calendar toggle
   Under the Sync Content heading, you will see toggles for Mail, Calendar, and Contacts. If the Calendar toggle is off, tap it to turn it on. The toggle will turn blue when active.
5. Set the Calendar sync period
   Tap Calendar and choose a sync period. Select All to sync all past and future events. You can also select 1 month, 3 months, or 6 months. A shorter period uses less storage but may miss older events.
6. Force a manual sync
   Return to the account settings screen. Pull down from the top of the screen until the spinning sync indicator appears. Release to trigger a manual sync of all folders.
7. Check Android calendar permission
   Open your phone’s Settings app. Tap Apps > Outlook > Permissions. Ensure the Calendar permission is set to Allow. If it is set to Deny, tap it and select Allow. Return to Outlook and pull down to sync again.

Steps to Restore Calendar Sync on iOS

1. Open Outlook and go to Settings
   Tap your profile picture or the menu icon in the top-left corner. Tap the gear icon to open Settings.
2. Tap the account with the calendar issue
   Under Mail Accounts, tap the email address that is not syncing the calendar.
3. Tap Sync Calendar
   In the account settings, look for the Sync Calendar option. Tap it to open the calendar sync settings.
4. Turn on Sync Calendar
   If the toggle next to Sync Calendar is off, tap it to turn it on. The toggle will turn green.
5. Select the calendar folders to sync
   After turning on Sync Calendar, you will see a list of calendars associated with this account. Ensure the checkmark next to your default calendar and any other calendars you need is selected. Tap Done.
6. Pull down to force a sync
   Return to the account settings screen. Pull down from the top to trigger a manual refresh. The calendar events should appear within a few seconds.
7. Check iOS Background App Refresh
   Open the Settings app on your iPhone or iPad. Tap General > Background App Refresh. Ensure Background App Refresh is turned on for Outlook. If it is off, the app cannot fetch calendar data when running in the background.

If Outlook Still Has Issues After the Main Fix

Calendar events still do not appear after enabling the toggle

If you turned on the Calendar toggle and forced a sync but events remain missing, the account may have been added with a different authentication method that does not support calendar sync. For example, adding a Gmail account using IMAP instead of Google’s OAuth method will sync only mail. Remove the account from Outlook and add it again using the Add Account option. During setup, ensure you see a prompt that mentions Calendar and Contacts access. Accept that prompt to grant full sync permissions.

Calendar shows events but they are outdated

Outdated events indicate that the sync period is set too short or the server is not pushing changes. In the sync settings, change the Calendar sync period to All. If the events are still old, check the server-side calendar by logging into Outlook on the web. If the web version shows the correct events, the issue is on the mobile client side. Force a full resync by toggling the Calendar sync off, closing the app, reopening it, and turning sync back on.

Calendar sync works on Wi-Fi but not on mobile data

This behavior points to a data restriction setting on your phone. On Android, go to Settings > Apps > Outlook > Mobile data and ensure Background data is allowed. On iOS, go to Settings > Outlook and ensure Mobile Data is turned on. If your phone has a data saver mode, add Outlook to the list of apps that are allowed to use background data.

New events created on the phone do not appear on other devices

When you create an event in the Outlook mobile app but it does not show up on your desktop or web calendar, the event is saved locally instead of being synced to the server. This usually happens when the account is set to sync only mail. Verify that the Calendar toggle is on in the sync settings. If it is already on, remove the account and add it again. After re-adding, create a test event and check if it appears on another device within 30 seconds.

Item	Android Fix	iOS Fix
Calendar sync toggle	Settings > Account > Sync Settings > Calendar toggle	Settings > Account > Sync Calendar toggle
Calendar sync period	Settings > Account > Sync Settings > Calendar > select All	Not configurable per account; select calendars in Sync Calendar list
System calendar permission	Phone Settings > Apps > Outlook > Permissions > Calendar > Allow	Not required; app uses Exchange ActiveSync natively
Background data restriction	Phone Settings > Apps > Outlook > Mobile data > Background data	Settings > Outlook > Mobile Data toggle and Background App Refresh
Force manual resync	Pull down from top of account settings screen	Pull down from top of account settings screen

If you have followed all the steps above and the calendar still does not sync, the problem may be on the server side. Log into Outlook on the web and verify that your calendar contains events. If the web calendar is empty, the issue is not with the mobile app. Contact your email administrator to check if your mailbox has a calendar folder and if it is visible to your account.

You can now restore calendar sync on your Outlook mobile app without reinstalling it. Start by checking the Calendar toggle in the sync settings for your account. If that does not work, verify the system-level calendar permission on Android or the Background App Refresh setting on iOS. For persistent cases, remove the account and add it again using the Add Account option, which forces a full folder discovery.