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.

Microsoft warns 400 million PCs risk losing updates as Windows 10 support ends in 2025. Users must upgrade hardware for Windows 11, pay for extended security, or risk cybersecurity threats.

With Windows 10's end-of-support deadline approaching in October 2025, these users face a dilemma: either update to Windows 11 with potential compatibility issues or continue using Windows 10 and risk losing security updates.

The global numbers fall within the margin of error to some extent, but the US numbers seem more clear-cut. This change comes after Microsoft’s confirmation of a 12-month extended support option for Windows 1 users from next October. This will cost $30 per PC, but for those stubborn Windows 10 holdouts, it could be worth it.