Win7 is nice too, but I admit I didn't use it much (as I was a Linux user almost exclusively when 7 was released). I got Windows 10 on a new laptop and gave it an honest try (along with the new Linux subsystem), but the little annoyances and inconsistencies piled up, and back to Linux I went.

I spent a lot of time with Windows 2000 back in the day. Windows 2000 was the first OS I bought retail -- my new PC came with Windows ME and it was so terrible I ran out and actually paid for an OS ;)