Well, it must be the OSes we used that are the most memorable to us.
The ones I've used extensively are DOS (and Win3.1, which is technically just a very clever shell on top of DOS),
Windows 98SE (having mostly skipped 95) which was on my longest-running retro PC, finally disconnected last year and put in storage for lack of use)
XP, Vista, Win7. I used to like Vista a lot because of how people kept saying how crappy it was and I knew that not to be the case (at least since SP1 where it matured and stabilized; I ran it on my primary desktop from 2008 till 2018, when program compatibility finally bogged down).
Now most of my active computers use Windows 10, some use Windows 11, and a few retro systems still use Windows 7 or XP (if they are older). However, I no longer feel special attachment to any OS. They are just tools.
