[REVISION HISTORY]

Microsoft Office update KB5002907 licensing issues

Updated 3 times since CLSTR started tracking revisions of this situation.

What changed

2026-09-30 09:08 UTC → 2026-10-02 06:33 UTC · added ~~removed~~

Microsoft’s optional update KB5002907, intended to bring Microsoft 365 applications that are more than 90 days behind in the Current or Monthly Enterprise Channels up to date, has been linked to widespread technical issues for users with perpetual licenses. Reports indicate that users of Microsoft Office 2016, 2019, and 2021, specifically Home & Business editions, experienced sudden deactivation of their software. This resulted in ‘Product Unlicensed’ or ‘Product without license’ warnings, reduced functionality, or in some cases, the complete removal of the applications from the system. Affected users reported being caught in loops requiring repeated product key entries or account sign-ins to restore stability. Microsoft has ~~paused~~ confirmed the error and suspended the distribution of the KB5002907 update to prevent further impact. Because the update was optional and required manual installation through Windows Update, the number of impacted users is limited to those who specifically chose to download it. Preliminary findings suggest the issue may stem from an architectural discrepancy between older Office versions and modern Windows components, specifically regarding the mixing of 32-bit and 64-bit components. While re-entering a product key can resolve many activation issues, users whose software was entirely removed may need to perform a full reinstallation.

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