If your business runs Office 2016 or Office 2019 as a one-time purchase rather than a Microsoft 365 subscription, and you’ve noticed Office suddenly acting as if it isn’t licensed — a nag screen, reduced functionality, or features disappearing — you’re not alone, and it isn’t something you did wrong.
What actually happened
Microsoft released an optional update, KB5002907, in late September 2026, intended for “out of date” Microsoft 365 Apps installations. Instead, on a number of machines running perpetually-licensed Office 2016 and Office 2019, it caused those installs to appear deactivated or unlicensed, even though nothing about the licence itself had changed. Microsoft paused the update’s rollout once the reports came in, and as of now there’s still no fix — the update remains paused, and Microsoft hasn’t published a resolution timeline.
This matters because perpetual-licence Office is common in exactly the kind of business that prefers to buy software outright rather than pay a recurring subscription — and the whole point of that licence is that it’s supposed to keep working indefinitely, update after update, without this sort of surprise.
Why this is worth taking seriously even though it’s “just a bug”
A licensing glitch isn’t a security hole, but it’s still a real business disruption. If Word or Excel suddenly refuses to save a file, or nags a staff member mid-task, that’s lost time on an ordinary working day — and if it happens to several people across a practice or office at once, it looks a lot like an IT outage even though the actual cause is a single bad Microsoft update sitting on each machine.
It’s also a reminder that “it’s not connected to the internet for updates” isn’t quite the same as “it’s immune to vendor changes” — optional updates still reach machines that check in with Microsoft’s update servers, even on perpetual-licence software.
What to do about it
1. Check whether any of your machines have already installed KB5002907 and are showing licensing errors on Office 2016 or 2019. If Office suddenly looks unlicensed with no change on your end, this update is the most likely cause. 2. If it hasn’t been applied yet, it’s reasonable to hold off installing optional updates on Office 2016/2019 machines until Microsoft confirms a fix — this one is specifically optional, not a mandatory security patch, so there’s no cybersecurity trade-off in waiting. 3. If a machine is already affected, a repair install of Office (via Control Panel’s “Change” option, or the Office installer’s repair tool) has resolved it for some affected users, though it isn’t guaranteed until Microsoft issues an official fix.
If you’d rather not track Microsoft’s optional update releases yourself and just want someone checking this kind of thing before it reaches your staff’s machines, that’s exactly what our managed IT support is built to catch early.
You can follow Microsoft’s own update notice directly on its support page for KB5002907 — it’s being kept current as the pause continues.
A one-time Office purchase is meant to mean one less thing to manage. This particular update is a timely reminder that “one less thing” still benefits from someone keeping half an eye on it.