Yes, it sounds alarming. Microsoft has now confirmed it is force-updating millions of Windows PCs. Coming just as Google offers a free upgrade lifeline to the 500 hundred million PCs that cannot be upgraded, this may be unsurprising.

“Devices running Home and Pro editions of Windows 11, version 24H2 that are not managed by IT departments will receive the Windows 11, version 25H2 update automatically,” Microsoft says. That’s not the case for Windows 10 PCs — yet. If you have an eligible Windows 10 device, “you can check whether the update is available by selecting Settings > Windows Update and selecting Check for updates.”

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Microsoft has updated its support notification,” Neowin says, “about the upcoming end of support for Windows 11 version 24H2. The system has a typical two-year release schedule, which is about to end later this year. That means affected users will no longer receive security patches, fixes for known issues, technical support.”

Because the only way to keep getting those is to move from version 24H2 to 25H2,” Microsoft has now decided “to do that for you.” If you have a work-managed PC, this doesn’t affect you. But your home PC, is now in Microsoft’s crosshairs.

ZDNet tells users that while “no action is required on your part, you can postpone the update, but you can’t stop it.” And if the auto-update is alarming, the fact Microsoft uses AI to determine whether your PC is eligible may be even more so.

“Microsoft is using machine learning,” ZDNet reports. “The company explained that its machine learning uses a combination of testing, feedback, responses from its partners, diagnostic data, and real-life insights. Based on the results, the update gets aimed at PCs that are least likely to run into compatibility issues.”

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The big question is whether this is a dress rehearsal for the hundreds of millions of Windows 10 PCs that either have or do not have the free Extended Support Updates (ESU), but either way run out of runway in October.

The forced upgrade of Windows 11 PCs to a newer version is one thing, should there be a forced upgrade of Windows 10 to Windows 11 that will be a bigger deal.

This article was originally published on Forbes.com