"The next release of the Microsoft® Windows® operating system, code-named "Longhorn," is an essential milestone for many reasons. It is the first operating system built with managed code and the first to host a new storage subsystem (code-named "WinFS") that revolutionizes the concept of a file system. It is also the first operating system to support a natural search technology (Natural UI) that automatically resolves many of the ambiguities inherent in query text. In addition, Longhorn is the first operating system designed from the ground up with security and trustworthy computing at the core. These and other features suggest that Longhorn will change the way applications are built—not something that happens every day," says Dino Esposito on the Microsoft Developer Network, MSDN.
Groove's Ray Ozzie, a Longhorn design partner, also talks about it in an interview with eWeek. However, things don't look good for a Mac version of Groove. "I just don't have customer demand right now to fund a native port," says Ozzie. "I would love to do it. I would really love to do it. I just don't know how to fund it."