Falling Leaf Systems has announced that they will be providing compatibility software that will allow Halo 2, an exclusive Vista title, to run on Windows XP. If you order Halo 2 through their site, you'll get the compatibility libraries FREE when they're released (current estimate is July).
On the heels of the merger also comes the announcement of Falling Leaf Systems' intention to provide compatibility software to allow Windows XP users to play two upcoming, Windows Vista-only titles: Halo 2 and Shadowrun. These games are available for immediate preorder through the companies' website. Orders will be fulfilled by Amazon.com, and those who purchase will receive a free copy of the compatibility software within a few months.