Yeah upgrades here, there and everywhere!
Got to say thats on good thing with windows, supports arround for ages, in addition to my laptop thats running XP that I use for everything, I've got a box thats got XP (nevergone bothered going to vista) and even though its 7 years old it still can run anything, where as apple update to a "new" os every 18 months or so which buggers up softwares unless you get the latest version or softwares only available for the previous version, or the version before which ends up being ruddy confusing as well as pretty much forcing an upgrade to either a new comp or OS (think maya 09 might not be PPC supported too and needs leopard).
But yeah its a minefield!!
"No pressure, no diamonds" Thomas Carlyle