This was resolved in The Raiser's Edge 7.96, patch 4, released in May 2017 and applied to databases in Blackbaud Hosting Services. If your database is installed locally, download and install the latest version and patch, if applicable.
If the Add-ins tab is still missing:
- Run Outlook as Administrator when integrating with Raiser's Edge.
- Download and run the REREGISTER utility: How to download and run the REREGISTER utility. Note: Run the REREGISTER utility as Administrator to ensure the files are registered properly.