Halo 2 Only on Vista

iLogiK writes "Halo 2 will be available for PC, but only in Windows Vista. From the announcement: 'Halo 2 the game that redefined first-person combat and multiplayer action for millions of gamers worldwide, is set to explode onto PCs exclusively for Windows Vista. Halo 2 for Windows Vista will be developed by a dedicated Microsoft Game Studios team in partnership with Bungie Studios.'" That's one way to force upgrades. I thought just not releasing patches for the microsoft-worm-of-the-week would be enough ;)