Users can empty this cache so Outlook can download all the items from your Exchange account again.

If the cache becomes corrupted, it will cause synchronization issues in Outlook. Unlike Outlook for Windows, Outlook for Mac 2011/2016/2019/2021 and Microsoft Outlook for Mac for Office 365 for Mac always runs in Cached Mode and it is not possible to switch it to Online Mode. Sometimes Outlook may go to Work Offline status when there are intermittent issues with the Internet connection

Make sure that the Work Offline mode is turned off in the affected Outlook for Mac: select Outlook in the upper right > Work Offline > there will be a checkmark next to Work Offline when you are in Offline Mode, uncheck it. Important: Tests should be run on the affected computer while the user is experiencing connectivity issues. To troubleshoot connectivity issues locally in Outlook, follow the steps listed below one by one and see if the problem persists after each step.

Keep the number of subfolders in Inbox and Sent Items to minimum.

If an issue is not reproducible in OWA, then it is local in Outlook and can be caused due to the following reasons: If the server is still unavailable, run traceroute command (see below) and provide Support with the results. Verify your password is correct, ask the account administrator to reset your password if necessary or reset it via Forgot Password option.Ĭlear browser cache, restart OWA and try again.

That will allow you to determine if your connection to the server works fine. As a first steps, check if you can log in to Webmail (OWA) and reproduce the issue there.

Outlook mac keeps asking for password