It appears as though Microsoft has revealed that their popular Xbox Live service will be built into "the PC" – something that indicates it could very well be a part of Microsoft’s next operating system, Windows 8. Mike Delman, VP of global marketing at Microsoft’s Interactive Entertainment Business group, was interviewed by The Seattle Times (via WinRumors) at E3 and had this to say:
Live has been successful on the Windows Phone. Live will be built into the PC. It will be the service where you get your entertainment. We were talking about it — you will not just see consoles and handhelds at this show next year, this show's going to morph into other devices.
When asked directly how the Live service would be part of Windows 8, Delman mentioned how Microsoft wants users to be able to use the service seamlessly between devices, indicating the possibility of a familiar Xbox Live interface in Windows 8 as well as Windows Phone 7. He also mentioned how Xbox Live will be the "passive media service across devices."
With Windows 8 going the way of the Metro Design Language as first seen in Windows Phone 7, and the Xbox 360 following suit, it is not surprising to see that Microsoft wants to integrate their popular media/gaming service into their next operating system. They have already integrated it into their latest phone OS, so the PC market is next on the list.