[Null]

i think i read the reason its vista only was because of DirectX 10 will be on vista.

i dont know if that means that dx10 wont be on xp or what, its possible DX10 is for 64bit only, but theres a 64bit xp so i dunno how that works

but MS doesnt need a game to sell vista, vista will sell and will sell more then likely quite well, unless they really mess it up like with WinME.

and aside from that, i think they all know that the game certainly woudlnt be the one to sell an OS, PC gamers really just dont care about halo, not with so many better fps's to choose from.