Upgrading to Windows Vista has been a broad leap for the few PC gamers out there who have made the jump. Unlike previous Microsoft software releases the feature set of their latest OS just isn't that compelling.
Sure, you get to play all the latest Games for Windows Live titles, but there's so few of them. Add on to that the still shaky hardware performance and the Halo 2 Vista servers are looking pretty empty.
Clouds look to be clearing up though for those still hesitant to upgrade just to play Halo 2 or Shadowrun. Falling Leaf Systems, a company working to get rid of the barriers constraining many PC gamers have with playing Games for Windows titles, has announced that they will be working independently to get Shadowrun and Halo 2 to run on XP machines.