Outlook for Mac stops syncing inbox while status shows connected

Huff Jennifer 275 Reputation points
2026-01-06T12:16:13.4266667+00:00

Im using Biz Outlook on my M4 , the mailbox status shows as connected, but new emails stop syncing until the app is restarted. Sending mail continues to work, and the issue affects only specific folders such as Inbox or shared mailboxes, help me plz

Outlook | MacOS | New Outlook for Mac | For business
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Answer accepted by question author
Jayden-P 26,275 Reputation points Microsoft External Staff Moderator
2026-01-06T13:01:03.79+00:00

Hi @Huff Jennifer

Thank you for posting your question in Microsoft Q&A. 

To assist you better, could you please provide additional information.

What is your current New Outlook version and build? You can check this in Outlook > About Outlook.

First, you could try to remove and re-add the account. In Outlook, go to Outlook > Settings > Accounts > Remove your account then add the account back.

If the issue persists, may I ask where did you download the app? (From App Store or directly from Microsoft Website)

If you got the app from App Store, please uninstall it and download it via Update history for Office for Mac - Office release notes | Microsoft Learn

You can either choose the latest version (16.104) or previous build if you don't meet the behavior before. My recommendation is Outlook version 16.102.x.

I also found this Microsoft Support article: Outlook for Mac and Outlook Mobile intermittently stop syncing - Microsoft Support. The Outlook team is investigating this issue, and it might be related to mailbox synchronization. 

Please try and let me know if it works for you.

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  1. AI answer

    2026-01-06T12:16:22.2966667+00:00

    It seems that you are experiencing an issue where your Outlook for Mac shows that it is connected, but new emails are not syncing in your Inbox or specific folders until the application is restarted. This type of problem can sometimes occur due to issues with the Cached Exchange Mode or conflicts in the processing of incoming emails.

    Here are a few troubleshooting steps you can try:

    1. Clear Offline Items: Go to the Inbox folder, right-click, and select Properties. In the General tab, choose "Clear Offline Items" and then resynchronize the folder by pressing Shift+F9.
    2. Restart Outlook: Since you mentioned that restarting the app resolves the issue temporarily, this might be a necessary step until a more permanent solution is found.
    3. Check for Updates: Ensure that your Outlook for Mac is updated to the latest version, as updates often include bug fixes.
    4. Rebuild the Profile: If the issue persists, consider creating a new Outlook profile to see if that resolves the syncing problem.

    If these steps do not resolve the issue, you may want to reach out to Microsoft support for further assistance.

    References:

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