Microsoft announced it will extend its Xbox Live gaming and entertainment network to the Windows platform. The first game that will take advantage of this is the Windows Vista version of Halo 2, which will be launched in May.
The launch of Games for Windows — LIVE marks a major expansion of the Xbox LIVE service across multiple platforms, uniting gamers with a single identity, a single gamertag, a single friends list and a single list of achievements attainable on the Xbox 360 and a Windows-based PC. Games for Windows — LIVE gamers will be able to easily find and play supported titles online with their friends across a Windows computer or an Xbox 360. As a unified service with Xbox LIVE, Games for Windows — LIVE will be available in every country and region supported today by Xbox LIVE.
“Five years ago, we began building a service that now defines the bar for online gameplay,” said Peter Moore, corporate vice president of the Interactive Entertainment Business in the Entertainment and Devices Division at Microsoft. “The benefits of expanding Xbox LIVE to Games for Windows titles is twofold: We’re bringing together two communities that share a passion for playing online games, and we’re enhancing the online experience for PC gamers who have long desired seamless game and voice connectivity — it’s a win for everyone.”
Unfortunately, the service won't be free. I heard they will charge $49 a year to let you play with Xbox players.