Microsoft 365 update deactivates Office 2016 and 2019 licenses

Users report that an optional Microsoft 365 update, KB5002907, is stripping activation from perpetual Office 2016 and 2019 licenses, forcing repeated product key entry and warnings of reduced functionality. Support for both versions ended on October 14, 2025.

• Bug mainly hits Home and Business perpetual licenses
• Users link the issue to update KB5002907
• Re-entering the product key restores activation
• Support for Office 2016 and 2019 ended October 14, 2025