Last updated on April 17th, 2023 at 12:21 am
To enable an inactive add-in that keeps unloading on restart in Outlook you should follow these steps:
First shut down Outlook, then uninstall the software providing the add-in from your machine.
Then go into regedit whilst logged in as the affected user and go to the following location:
HKEY_CURRENT_USER\Software\Microsoft\Office15.0\Outlook\Resiliency
Delete the REG_BINARY keys found in DisabledItems and CrashingAddinList folders:

Then navigate to this location:
HKEY_CURRENT_USER\Software\Microsoft\Office\Outlook\Addins
Then delete the key (folder) that references the add-in (we are using Mimecast as our example below):

Reinstall the software that provided the add-in and then restart Outlook. The add-in should now load.
Comments
If you have any questions or comments on this guide, please feel free to leave us a message below using our comments system.
Free Subscription
If you want to be notified when we post more quality guides like this one, sign up to our free subscription service and you will receive an email when a new post is live.
No need to worry, we will not be filling your inbox with spam and you can unsubscribe anytime you like.