You might come across some clients that have VALID volume license keys for office, but Windows is still flagging the Office application as not genuine. This could happen if the user might have installed a version in the past that wasn’t licensed properly. Here’s a solution to remove the message. Again, this is only to be done if the VLK is VALID.

1. Run Registry Editor (RegEdit.exe)
2. Highlight and select “my computer” on the left
3. Press Ctrl-F to open search box, and search for OGAAddin.connect registry key
4. Press F3 until you see LoadBehavior in the right side
5. In the right pane, right click on Load Behavior and select Modify
6. Change the value data from 3 to 0
7. Repeat steps 4-6 for each and every LoadBehavior found

Changes to the registry are at your OWN RISK.