
To do it: open up Outlook > right-click the desired folder and scroll down to Properties > select Empty Cach e on the General tab.Ĭaution:The following procedure deletes any information that is not synchronized with the Exchange server, including your contacts' mail certificate.

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.

As a first steps, check if you can log in to Webmail (OWA) and reproduce the issue there.
