well i am still a proud user of the legacy Windows XP
Windows XP was good... then it sucked ass... now it's great.
It was good when it came out because it was a nice step-up from the shit-fest that was ME.
It sucked ass when spyware started becoming really popular because it was infecting everyone's computers and no one knew what the fuck was going on or why their computer was running like turd on a snail.
Now it's great because it is a champ when it comes to performance and Vista is a slug on old machines.
But I love Vista... I actually use a lot of it's nice features. XP is okay but I often run into situations where I wish I was using Vista instead.