More than 800 million Windows 10 users and another 50 million on even older, already obsolete versions of Windows. Of the 800 million Windows 10 users, more than 400 million likely don’t meet the TPM 2.0 threshold.

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.

Microsoft has once again temporarily halted the rollout of its latest major Windows 11 update, also known as 24H2. This time it is for systems running select Ubisoft games following widespread user reports of crashes and performance issues.

"If you proceed with installing Windows 11, your PC will no longer be supported and won't be entitled to receive updates."

Microsoft warns users of unsupported hardware using Windows 11 with a disclaimer Windows 11 will add a watermark if system requirements aren't met Continuing to use Windows 11 on incompatible hardware may void support and warranty.