Microsoft's Sleazy Tactics in the Video Game Industry?

Dyrandia asks: "I'm currently working on a Legal and Ethics course for my software engineering degree and have decided to write about microsoft's tactics of buying up video games and companies in order to keep games limited to their own platforms (pc and xbox). I am currently using the following games as examples: Oddworld: Munch's Oddysee; Halo (Microsoft bought the developers, however rumour has it that Halo will actually make it to PC next year); and Shenmue 2 (they even bought the rights to it so that it couldn't be released for the Dreamcast in the US, even though it was released in Japan and Europe). Does anyone know of URLs for sites that would have more information and possibly other games Microsoft has used similar tactics on?"