First os I touched was of an apple computer, I don't know how it was called and I also didn't bother. After that I came in touch with something I remember as TOS on an atari... after that I used some terminal like system, wich was unix based and then DOS... after dos the whole thing came windows 3.1 95 then I moved to redhat. I don't know in what order, but then came all stuff like win 98 98se me 2000 xp, open free net BSD, unix netware and blabla linux gentoo mandrake slackware lycoris uhu etc etc. and some "special" os's like beos menuetos and lot's of others I didn't really look into... pfew