It's been confirmed as false. Nvm.
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It actually makes a lot of sense. I mean, think about it. We know that a new Halo title isn't coming out this year, and that the new Xbox is highly likely to. Putting the original Halo trilogy on Steam would make up for the lack of a Halo title this year as so many people would flock to buy it on Steam. Virtually everyone who's heard the news is dying to get Halo 3 on the PC. It would be a massive hit.