You know, seeing as I've never owned an xBox (or a PS3 for that matter) I can't help but feel I'm missing out on something here. Are any of these games ever
going to come out on Windows, or does Microsoft not like that platform or something?
I think it was initially part of their strategy. Release the first part on PC to get people hooked then make them buy an Xbox. Hell, it worked on me. I picked up Halo 1 for PC waaay back when it was in a bargain bin for like £10 (Just before Halo 2 came out). I installed it on Friday evening and completed it before Sunday evening. Hellova weekend. If you enjoy it the first one on PC, I'd say its likely you'll enjoy the sequels and such on Xbox, and if you have an Xbox, you might as well go and enjoy all the other great games like Mass Effect, Red Dead Redemption and Gears of War.