Windows gamers linked into Xbox Live network.
Microsoft has extended its Xbox Live games and entertainment network to the Windows platform.
The new service will start in the US on the 8th of May with the launch of the Windows Vista version of the Xbox blockbuster Halo 2.
Games for Windows - Live will connect Windows users to over six million gamers already in the Xbox Live community.
Multiplayer game Shadowrun will follow in June, allowing Windows gamers to connect with Xbox 360 players in cross-platform matches using a single service.
Games for Windows - Live will support a single identity, gamer tag, friends list and list of achievements attainable on the Xbox 360 and a Windows-based PC.
"Five years ago Microsoft began building a service that now defines the bar for online gameplay," said Peter Moore, corporate vice president of the Interactive Entertainment Business at Microsoft.
"The benefits of expanding Xbox Live to Games for Windows titles are twofold. We are bringing together two communities that share a passion for playing online games, and we are enhancing the online experience for PC gamers who have long desired seamless game and voice connectivity. It's a win for everyone."