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I hope that when Halo 2 comes out that it stays on just Xbox and does not go to PC. The Xbox needs great games like Halo 2 to stay 100% exclusive to Xbox.
Microsoft will put it wherever it makes money. Since it basically owns the PC market, it will probably go PC.
Only PC's with great everything will be able to play it, cause all an xbox is is a suped up PC in a box.