Microsoft pulls Office update that deactivated or deleted Office 2016 and 2019

Microsoft has stopped the rollout of KB5002907, an update meant to fix stuck Microsoft 365 installations, after it broke perpetual copies of Office 2016 and Office 2019. As part of the repair action applied by this update, some devices were left without functioning versions of Microsoft 365 Apps or Office. To prevent additional devices from being affected, Microsoft has paused the rollout.

If you own Office 2016 or 2019 (the “buy once” versions, not a subscription) and Word, Excel or Outlook suddenly says “Unlicensed Product” or has vanished from your PC in the last few days, this update is the likely culprit. Your license is still valid. You just need to reactivate or reinstall.

It’s another patch failure by Microsoft this month after the Excel copy/paste bug that still isn’t fixed despite several weeks passing.

What went wrong

KB5002907 was released around September 23, and problems surfaced a day later. The optional update was designed only for Microsoft 365 subscription installs that haven’t been updated for over three months.

The affected installations were all Office 2016 and Office 2019 Home & Business perpetual licenses.

The damage comes from how the update works. It appears to remove and reinstall, or migrate, the existing Office installation. On systems that mix architectures, such as a 32 bit Office suite alongside a 64 bit Microsoft Access Runtime, the reinstall can fail because Office setup does not allow 32 bit and 64 bit products together. In that case, the existing suite is removed but not reinstalled, leaving the PC without Office.

In plain English: the update tore down Office to rebuild it, then couldn’t finish the job.

Microsoft calls this an optional update that won’t install by itself. That’s the official line, but some reports say it installed automatically on some systems anyway. So don’t assume you’re safe just because you never clicked “install.”

Fix if Office says “Unlicensed Product”

This is the more common outcome. Your programs are still there; Office just forgot it was paid for.

• Open Word or Excel and follow the activation prompt.
• You may need to sign in with the Microsoft account associated with your purchase or follow the Office Activation Wizard.
• If you bought a boxed or retail copy with a product key, have that key ready.

Fix if Office has disappeared completely

Microsoft says this happens only in “rare cases,” which is cold comfort if it’s your PC. You’ll need to reinstall from scratch using Microsoft’s guide: Download and install or reinstall Office 2021, Office 2019, or Office 2016.

One user’s fix is worth noting: reinstalling Office 2019 from the Microsoft account associated with the purchase, then signing out and back in, restored access.

Warning: if you have a 64 bit Access Runtime (common with some business databases and accounting add ons) alongside 32 bit Office, the reinstall may hit the same wall. You may need to remove the Access Runtime first, reinstall Office, then reinstall a matching 32 bit Access Runtime. If a vendor supplied that database, check with them before you start.

Your documents, spreadsheets and email data files are not affected by the uninstall. It removes the programs, not your files.

How to protect yourself until Microsoft fixes it

The rollout is paused, but Microsoft has not said when KB5002907 will return, or whether a revised build will exclude perpetual Office installations. A few sensible precautions for Office 2016 and 2019 owners:

• Find your product key or purchase account now, before you need it. Most copies bought since 2016 are tied to a Microsoft account, visible under Services & subscriptions at account.microsoft.com.
• Consider turning off “other Microsoft products” Windows updates for now. Go to Settings | Windows Update | Advanced options and switch off Receive updates for other Microsoft products. That’s the exact switch this update travels through. Turn it back on once Microsoft reissues a fixed version.
• Don’t install optional updates you don’t need. Under Settings | Windows Update | Advanced options | Optional updates, skip anything mentioning KB5002907.

What the update was actually supposed to do

For Microsoft 365 subscribers, the idea behind KB5002907 is reasonable. It’s offered only to Windows PCs with Microsoft 365 Apps installations that are more than 90 days out of date and on Current Channel or Monthly Enterprise Channel. Installing it can help the apps resume updating and move to a current build.

If you’re a subscriber and your Office updates are working, you don’t need it. You can check under File | Account in any Office app; the version and build appear under About. If you’re stuck on an old build, try File | Account | Update Options | Update Now first. That’s the simple, safe route and doesn’t involve this update at all.

Work or school PCs are mostly untouched. If your organization manages Microsoft 365 Apps updates with Group Policy or Cloud Update, this update makes no changes to your device.