The interesting twist to these Windows 10 numbers is the 400 million or so users that don’t have the right hardware to upgrade. While there are various options to upgrade on a non-compatible PC, Microsoft has just firmed up its warning that doing so could stop further updates and even invalidate any hardware warranties still in place.

In an update to a Windows 11 support document as spotted by Neowin, Microsoft warns that a watermark will be added to the desktop on any PC that's been upgraded to Windows 11 without meeting the minimum requirements. Further, a notification may pop up in the Settings app to indicate that the computer doesn't meet the necessary requirements.

The TPM hardware requirement for Windows 11 was one of the biggest barriers to initial upgraders three years ago. And while that’s become less of an issue, it’s still a point of contention for many users.