I really like windows 10 & 7, but i still have a soft spot for windows Vista.
Very old school for sure.I can not forget Windows 3.11. It worked really well, although I think it was not an OS by itself, I think it was a MS-DOS 6.2 graphics platform, but I don't remember it clearly.
And the Oscar goes to:
Yes, I know, I´m an old school guy