Why does this happen?
- Microsoft has some security measures in place to prevent slow add-ins from running inside Outlook. The issue is however that in many cases add-ins without fault are mistakenly marked as slow and disabled by Outlook.
What can i do about it?
There are several things you can attempt:
- Make sure you run Outlook as an Administrator when you enable the add-in (Right click - Run as Administrator)
- If that doesn't work follow the steps in this article: https://www.outlook-apps.com/inactive-outlook-add-ins/