How to sync Microsoft Outlook calendar with Android device.

To sync your Microsoft Outlook calendar with Android, add your Outlook account in Settings → Accounts → Add Account → Exchange/Outlook, then enable calendar sync.

Hi, I'm John!

You mentioned the calendar sync toggle is greyed out, but contacts work. That usually points to a permission or account type issue.

Try this first:

• Open Outlook app on your Android > Tap your profile icon > Tap the gear icon (Settings).
• Select your account > Look for "Sync calendars" and try to enable it.

If it’s still disabled, check this:

• Go to your phone Settings > Apps > Outlook > Permissions.
• Make sure Calendar permission is allowed.

If issue persists please try the "Try guided support" option here: https://support.microsoft.com/office/how-do-i-sync-my-outlook-calendar-to-the-default-calendar-app-s-26c02128-c72f-4f49-90c8-3eafc3ecd581

Click "Add comment" to let me know.

Regards,

John J.D.

On Android, Outlook can sync its calendar to the device’s default Calendar app, but this is controlled from within Outlook and depends on the account type.

Try the following steps:

1. Enable calendar sync in Outlook for Android
   1. Open the Outlook app on the Android device.
   2. Go to Settings.
   3. Select the email account whose calendar should sync.
   4. Go to Calendar and look for Sync calendars.
   5. If possible, toggle Sync calendars on.
   Outlook supports two‑way calendar export only for:
   • Microsoft 365
   • Outlook.com
   • On‑premises Exchange mailboxes using hybrid modern authentication
   If the account is IMAP/POP or another provider that does not support this, the calendar sync slider may be disabled while contacts sync remains available.
2. Verify the account is not set up as IMAP
   1. In Outlook for Android, go to Settings.
   2. Tap the account.
   3. If it is configured as IMAP/POP, remove it and re‑add it using the Exchange/modern authentication option (if supported by the provider). IMAP accounts cannot sync calendar and may cause calendar options to be unavailable.
3. Check calendar visibility in Outlook
   1. Go to the Calendar tab in Outlook.
   2. Tap the three lines (menu) in the upper left.
   3. Under the email account, ensure Calendar is selected so the Outlook calendar itself is active.
4. If sync still does not work
   1. In Outlook, go to Settings > tap the affected account > Reset Account and test again.
   2. If needed, delete and re‑add the account in Outlook for Android using the supported method for calendar sync.

If the account type does not support calendar sync (for example, only IMAP is available), the calendar sync slider will remain disabled and calendar export to the Android default Calendar app will not be possible from Outlook.

References:

• How do I sync my Outlook Calendar to the default Calendar app(s)?
• Can't sync calendar and contacts with my phone or tablet