During today's keynote at WinHEC 2006, Bill Gates introduced Microsoft Server Virtualization (MSV) as an add-on to Windows Server, code-named Longhorn. MSV allows multiple virtualized server operating systems to run concurrently on single-server hardware. The interesting part is that MSV also supports non-Microsoft operating systems, such as Linux. MSV, available for 64-bit versions of server operating systems only, offers some very powerful management tools, including the ability to add peripheral devices and to allocate system memory to the virtual operating systems in real time. MSV is expected to be available within six months after the launch of Windows Server Longhorn, which itself is expected to debut in the second part of 2007.