I work for MDA, and I assure you its WinXP on everything. Everything.

Sadly at the end of this year its a full push to WinVista, even though we have had everyone from IT basically beg for them to skip Vista and move straight to 7. The Civ in charge of IT as a whole thinks Vista is a cleaner upgrade path though, and if a civie wants it, 99.9% of the time the civie gets it.

I've had my slimline for about 4 years now, and the only problem I have had is with the laser not reading DVD movies anymore, which doesnt bother me, thats what I have a DVD player for. And I keep that thing running almost 24/7, so that says alot about the quality of the hardware. MS can only hope to produce something remotely similar.