Support for Win 8 ended this month, so no more security updates. Win 7 support ended 3 years ago unless you paid for it, and it still has a 10% share.

Win 10 has a 68% share and will be supported till October 2025, which could well be extended. Win 11 currently has 17%.

This is the end, Windows 7 and 8 friends: Microsoft drops support this week

You can no longer buy Win 10, though it's apparantly easy to find a downloadable copy. A lot of them will be booby trapped. Win 11 won't run on 32 bit PCs if you still have one of those.

Meanwhile Microsoft is trying to make Office less of a target for malware.

Microsoft closes another door to attackers by blocking Excel XLL files from the internet

Microsoft is checking everyone's bags for unsupported Office installs