kb5002907

KB5002907 is an optional Microsoft 365 Apps update distributed through Windows Update that drew attention after Windows users with perpetual Office 2016 and Office 2019 licences reported losing activation. According to reports, previously activated installations began showing "Unlicensed Product" warnings and countdown banners, with some users repeatedly re-entering product keys. Microsoft had not confirmed a cause at the time, and the connection rested on timing and a growing number of matching complaints rather than documented known issues. The tag covers that activation-loss discussion and the troubleshooting questions it raised for Windows administrators and Office users evaluating whether to install the update.