Heck, I’m still using XP at home. I have 7 at work and it drives me nuts with the dumbed down interface. The Office ribbons really drive me nuts. I don’t think that making a tasks take 5 to 7 clicks is a functional improvement over 1 or 2 clicks.
I’m running Office 97 on Win 7.
I really like the stability of Win 7 but hate the interface changes in Office.