Outlook 2013 and later versions provide add-in resiliency. This means that Outlook will disable an add-in if it performs slowly.
In most cases, when this happens, the procedure explained in this article is sufficient to re-enable the Outlook add-in.
Unfortunately, in rare cases, Outlook may permanently disable the add-in which will then cause this procedure to fail.
If this is the case for you, here is the solution to unlock the situation:
- Close Outlook
- Double-click on the .reg file corresponding to your version of Outlook
- If an alert message appears, please confirm
- Open Outlook
- Check that the Add-In is now enabled again