Which OS did you guys learn the ins and outs of first? Myself, I want to learn everything there is to know about Windows XP. Now, htere are probally some of you like," Err....you newbie, why don't you grow up and learn *nix, you freaking lamer." Well, you are intitled to your opinion. But, I think, that, learning ANY OS completly is a good idea. But, what was the first OS you guys learned? *nix? Windows? Mac? Please tell!