One of the most innovative features coming in Windows Longhorn Server isn't really a feature as much as a whole new version of Windows. It's called Server Core, and it will only take one-sixth of the disk space of a normal Longhorn installation. It's not expected to need anywhere near as many patches and hotfixes as Windows 2000. It's a version of Windows that does not, in fact, use windows. It's breaking Microsoft's long-standing reliance on graphical interfaces and shaking things up in several of Microsoft's product groups.