Outlook online archive is not storing / syncing

Dear Yatif,

Thank you for reaching out to the Microsoft Community. I’m sorry to hear that you’re experiencing issues with Outlook online archive not storing or syncing on your Mac device. This issue can be caused by several factors. Some of the common reasons include:

• Verify the Issue in Outlook Web App (OWA): Please check if you experience the same issue using Outlook on the Web (OWA) by visiting https://outlook.office365.com
• Version Compatibility: Ensure that your version of Outlook for Mac supports the online archive feature. Older versions may not fully support it, so please make sure you’re using the latest version of Office 365 for Mac.
• Account Type: Only certain types of accounts (e.g., Exchange Online) support the online archive feature. If you’re using a different account type (such as POP or IMAP), the feature won’t be available.
• Verify Offline Mode: Please check if the app’s offline mode is turned on. If it is, try turning it off and see if that resolves the issue.
• Network Issues: Poor network connectivity may prevent proper syncing with the online archive. Please check your internet connection or try switching networks to see if the issue persists.
• Mailbox Size/Quota: If the archive mailbox has reached its storage quota, new items may not sync. You can check the storage status in the Office 365 admin portal or Outlook to ensure there’s enough space available.
• Outlook Profile Corruption: Occasionally, an Outlook profile can become corrupted. Try creating a new Outlook profile on your Mac and see if the issue is resolved.
• Cache Settings: Verify that caching for online archives is correctly configured. Try disabling Exchange cached mode temporarily, then restart Outlook to see if this helps. Incorrect caching configurations can also cause syncing failures.
• Exchange Online Throttling: Exchange Online applies throttling policies that can limit syncing, especially if there are a large number of items to archive.

Additionally, please reach out to your IT administrator to ensure that the online archive feature is enabled for your mailbox from the Microsoft 365 admin portal. They may be able to assist further with troubleshooting or submit a support ticket if needed.

For more information, you can refer to this guide: Enable archive mailboxes for Microsoft 365 | Microsoft Learn

I hope these steps help resolve the issue. Please feel free to reach out if you have any further questions or need additional assistance.

Thank you for your time and cooperation.

Sincerely

Feroz Mahmud | Microsoft Community Moderator