Can’t Enable Inactive Outlook Add-ins

Uninstall the program that is crashing and then go to the registry locations shown below and remove the keys, then reinstall the add-in that was crashing.

HKEY_CURRENT_USERSoftwareMicrosoft Office 15.0Outlook Resiliency

HKEY_CURRENT_USERSoftwareMicrosoft OfficeOutlookAddins – remove the keys that refer to your troubled Outlook add-in

Sources

• http://www.outlook-apps.com/inactive-outlook-add-ins/