

If you get a permissions error when trying to disable an add-in see the Quick Tip Cannot disable add-in.ĭisabling troublesome add-ins can solve Outlook losing the AutoComplete cache. You can disable add-ins in the following way If Outlook now closes properly, you can enable your add-ins one-by-one (restarting Outlook after each one) to find out which add-in prevents Outlook from closing. To find out if your issue is being caused by an add-in, disable them all and see if the issue goes away. Various add-ins hook into Outlook in such a way that closing Outlook on its own has been made impossible. Solving shutdown issues caused by add-ins Your data file for issues in the background. The gears icon indicates that Outlook checks Error message about an add-in when starting Outlook again.


At that time, you’d usually see the outlook.exe process still running in Task Manager as well. Practically always this is caused by an add-in or another application which integrates with Outlook. It isn’t very common that Outlook doesn’t close on it’s own.
