🚨Microsoft 365 Update Deactivates Office 2016 and 2019
Your old Office install just got bricked by an update
TL;DR
A recent optional update for Microsoft 365 deactivates Office 2016 and 2019 installations, forcing users to re-enter product keys. This impacts Home and Business perpetual license users, especially those with outdated installations.
Microsoft 365's recent optional update is causing issues for Office 2016 and 2019 installations, deactivating them and forcing users to re-enter their product keys. This affects Home and Business perpetual license users, especially those with installations more than 90 days out of date. If you're still using Office 2016 or 2019, this update could strip your activation status and put you in a reduced-functionality mode. The update is not automatic, but it's causing headaches for those who haven't kept up with the latest builds. Support for Office 2016 and 2019 ended on October 14, 2025, and Microsoft is not obligated to release updates for these versions. If you're running outdated Office installations, you might want to check your activation status and be prepared to re-enter your product key.
Key Points
Microsoft 365's optional update deactivates Office 2016 and 2019 installations, impacting Home and Business perpetual license users.
Support for Office 2016 and 2019 ended on October 14, 2025, leaving users vulnerable to activation issues.
The update strips away authenticated status, forcing users to re-enter their product key or face deactivation or reduced-functionality mode.
Affected users report that re-entering the original product key can resolve the issue, but this may not be practical for users with multiple affected devices.
The optional update is designed to help apps resume updating and move to a current build for the device's assigned update channel.
Why It Matters
If you're still using Office 2016 or 2019, this update could strip your activation status and put you in a reduced-functionality mode. Support for these versions ended on October 14, 2025, and Microsoft is not obligated to release updates. This impacts Home and Business perpetual license users, especially those with installations more than 90 days out of date.
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