Why aren't Halo 1 and 2 on Steam? If they were released on Steam it would revitalize the online community and Microsoft would make an easy extra buck. There's no downside to it.
Microsoft already put a lot of their games on Steam - Fable 1, Fable 3, Age of Empires 3, Age of Empires Online, Microsoft Flight, Deadlight, Mark of the Ninja, Insanely Twisted Shadow Planet, etc... So it makes absolutely no sense that the Halo games aren't on Steam.
Microsoft please release Halo 1 and 2 on Steam! And while you're at it also give us PC gamers Halo 3 so we can at least "finish the fight"!
I know Microsoft doesn't read this forum. I just wish Microsoft cared enough to do this simple task.
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The last thing Microsoft would do is sell their IP or part of it to Valve. If you had one heck of a cash cow that made you so much money, why on earth would you let other companies sell your game?