There are rumours that Microsoft will unveil a Windows Home Server at CES 2007:
"Home server" has been "coming" since early 2005, called by various code names such as Quattro. The rumors from years past focused on centralized storage, and for good reason. As the number of computers in a home increase, the need for centralized storage increases as well. There are two major itches to scratch here. First, just because you're on the kitchen PC doesn't mean you don't want access to the Excel worksheet you've been hacking on in your office. Second, centralized storage also means centralized backup, giving you an easy way to backup the machines in your home over the local network. Look for shadow copy support to appear among the features of what is essentially a NAS solution for the home, managed via Windows. There's plenty of tech to borrow from Windows Storage Server, and this is what it looks like Microsoft is planning to do.