(and about 50 Million with older Windows versions).
Microsoft Windows Update—CISA October 29 Deadline Has Now Passed
..Timing-wise, the interesting twist with this October warning is the 900 million Windows 10 users yet to move to Windows 11, now just a year away from end-of-life meaning end of support, which will cut off those users from updates such as this. Worse, there are also a reported 50 million Windows users on even older legacy versions of the OS, which means their machines are wide open to these threats…
* 900 Million is a huge number. As some hundred million Windows 10 PC are not Windows 11 compatible moving them all to Windows 11 seems unrealistic.