Mail doesn't load in the most recent update of Outlook for Mac

Hi!

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Yes, there have been a growing number of reports recently of Outlook for Mac stopping mail sync after updates.

I advise to do a quick test by turning off new Outlook to shift to classic mode. Open Outlook, in the top-right corner, you should see an option to turn New Outlook OFF. (that will switch to classic mode).

Once in classic mode, try and sync again and see if inbox will be update.

Use the following steps to restore mail sync in the latest Outlook for Mac:

1. Confirm Outlook is online
   In Outlook, open the Outlook menu and make sure Work Offline is not checked. If it is, clear it so Outlook can connect and sync.
2. Verify Internet/network connectivity
   Use a web browser to confirm other sites and (if applicable) your mail provider’s webmail are reachable. If there is no network connection, Outlook will not sync.
3. Check for known sync issues and update Outlook
   There are known issues where Outlook for Mac can stop syncing or have trouble re‑syncing folder content:
   • When Conditional Access policies are enabled, Outlook for Mac may not be able to add accounts or may stop syncing. This is fixed in version 16.92 (Build 24120731). Install the latest Office for Mac updates to ensure this fix is applied.
   • IMAP Yahoo and AOL accounts can have issues where messages intermittently disappear and reappear. The workaround is to switch to the new Outlook for Mac by turning on the New Outlook switch in Outlook.
   Open any Office app, go to Help → Check for Updates (or use Microsoft AutoUpdate) and install all available updates so Outlook is at or beyond the versions that contain these fixes.
4. If sync still fails after updating
   • For IMAP Yahoo/AOL: ensure the New Outlook experience is enabled as described above.
   • If Conditional Access is used in the environment and Outlook is still not syncing after updating to 16.92 or later, contact the organization’s administrator to confirm policies and client versions.

If none of the above resolves the issue, use Outlook on the web as a temporary workaround while further troubleshooting continues.

References:

• Outlook for Mac stops syncing when Conditional Access is enabled
• IMAP Yahoo and AOL accounts might experience issues with re-syncing folder content
• I can't send or receive messages with Outlook for Mac
• Outlook for Mac and Outlook Mobile intermittently stop syncing