“Using a combination of dedicated servers, flexibility of the Windows platform, and the online innovation established in the Xbox original, Halo 2 for Windows Vista provides a best-in-class PC-to-PC multiplayer experience,” a Microsoft statement blasted today.

“Halo 2 delivers improved graphics, a custom map editor and the chance to earn achievements – a first for the Halo franchise.” 

Members who already play using Xbox Live automatically receive the functionality of Games for Windows Live, using the same gamertag and friends list, at no additional cost.

In addition, Games for Windows Live introduces the best of Xbox Live functionality to please PC gamers, such as integrated in-game multiplayer voice chat.

Functionality like dedicated server support is also included as part of the free Silver membership.

Gold members get a premium online network experience which adds benefits such as multiplayer achievements, matchmaking according to skill, reputation and gamerzone, as well as cross-platform gameplay.