Microsoft has several of their games free for download on their site.
http://www.windowsmarketplace.com/results.aspx?bcatid=922&&order=A&maxprice=.01
or
http://tinyurl.com/3yz5fq
They aren't the newest releases but you can find versions of many of their games.
(Solitaire, Age of Empires, Grand Theft Auto, Warcraft, Doom and Sudoko etc.)
http://www.windowsmarketplace.com/results.aspx?bcatid=922&&order=A&maxprice=.01
or
http://tinyurl.com/3yz5fq
They aren't the newest releases but you can find versions of many of their games.
(Solitaire, Age of Empires, Grand Theft Auto, Warcraft, Doom and Sudoko etc.)