Microsoft is going to introduce new version of GUI Less Windows for Web Servers. This will save memory and cpu time used by GUI, that never get used in a web server. Many love Linux servers as it is easy to manage services through command line. Windows servers are already as stable as Linux servers, with introduction of GUI-Less Windows for web servers will increase market share of Microsoft Windows on Web.
“We are making the server compose-able at three different levels in Windows Server ‘Longhorn,'” wrote Mark Aggar, senior product planner for Windows Server”.
Source: Microsoft Windows Server Bog