"Stutz has been acting as Microsoft’s liaison to the nascent Internet P2P community, and has already met with several P2P companies. "We’re now going to start talking to people who are developing peer-to-peer applications to find out what they need," he said."
As I speculated earlier, Groove and Microsoft have a relationship, at least through technical meetings.
03/20/01 update: Ray Ozzie was at the Hailstorm launch.
03/10/05 update: Microsoft to buy Groove Networks.