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Android Calendar and Outlook Calendar are Different

Neil Go 70 Reputation points
2026-02-02T21:46:51.0733333+00:00

My Outlook calendar and Android Calendar used to be identical, but recently I noticed that have some differences.

Normally I enter an event on my phone and it then populates to the Outlook calendar that I have on the web and also on the Outlook app on my phone. Recently, both Outlook calendars are not updating to the info from the phone. I have rebooted the phone and the Win 11 PC but not fixed.

Appreciate any suggestions to fix

Outlook | Outlook for mobile | Outlook for Android | For education
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  1. Neil Go 70 Reputation points
    2026-02-04T22:28:45+00:00

    I deleted the email account on the phone and then added it back in, and on first test everything seems to be working

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  2. Neil Go 70 Reputation points
    2026-02-03T23:23:13.3766667+00:00

    If I create an event on Outlook web or I create an event on Outlook mobile, it gets added to my Android calendar. If I create an event in the Android calendar, it does NOT get added to Outlook web or Outlook mobile.

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  3. Vergil-V 13,060 Reputation points Microsoft External Staff Moderator
    2026-02-03T01:06:18.89+00:00

    Hi @Neil Go 

    Thank you for contacting the Microsoft Q&A forum.   

    To better understand your situation, I’d like to clarify a few points. When you create a calendar event in Outlook on the web, does it successfully sync to your Outlook app on Android? 

    If events created on the web are syncing correctly, it is possible that events created on your Android device are being saved to a different calendar. When creating a new event in Outlook for Android, please tap the calendar dropdown and make sure you select the intended calendar before saving. 

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     In addition, aside from the calendar sync issue, is your mailbox in Outlook for Android functioning normally in all other areas? 

     

    In the meantime, you may try the following steps: 

    1/ Clear Outlook Mobile cache: 

    In my test environment, the steps are: Settings > Apps > App Management > Outlook > Storage Usage  

    Note: The exact path may vary slightly depending on your device, but the general steps should be similar.  

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    2/ Sign out of the affected account in Outlook for Android and sign back in. 

    If the issue continues after these steps, you may consider reinstalling the Outlook for Android app to refresh the application environment. 

    If I’ve misunderstood any part of your situation, or if you have further questions or updates, please don’t hesitate to reply. 

    Thank you for your time, and I look forward to hearing from you soon.

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  4. AI answer

    2026-02-02T21:47:00.17+00:00

    It sounds like you're experiencing synchronization issues between your Android Calendar and Outlook Calendar. Here are some steps you can take to troubleshoot and potentially resolve the issue:

    1. Re-create the ActiveSync relationship on your mobile device. This can often resolve syncing problems. To do this:
      • Remove the ActiveSync account from your mobile device.
      • Remove the ActiveSync relationship from Outlook Web App by signing in, going to Settings, selecting Options, and then navigating to Phone > Mobile Devices to delete the ActiveSync relationship.
      • Restart your mobile device.
      • Re-add the ActiveSync account on your mobile device.
    2. Check for third-party Outlook add-ins that might be interfering with calendar synchronization. If you have any add-ins that manage calendar items, try disabling them temporarily to see if that resolves the issue.
    3. Ensure that your mobile device is connected to the internet and that there are no connectivity issues.
    4. Check for updates for both the Outlook app and your Android operating system, as updates can sometimes resolve bugs and improve functionality.
    5. If the problem persists, consider exporting your calendar data to an Outlook Data File (.pst), deleting the existing .ost file, and allowing the server data to download again. You can then import the .pst file data back into Outlook using the "Do not import duplicates" option.

    These steps should help you troubleshoot the synchronization issues between your Android Calendar and Outlook Calendar.

    AI-generated content may be incorrect. Read our transparency notes for more information.

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