Microsoft Windows is a desktop and server operating system produced by Microsoft. Common desktop versions include Windows XP, Vista and Windows 7 and the most common server versions encountered will be Windows 2003, Windows 2003 R2, Windows 2008 and Windows 2008 R2.
Two major versions of the Windows code base still supported by microsoft are based on Windows NT version 5 and version 6.
Systems based on the NT 5 code base include Windows 2000, Windows XP, Windows 2003 and Windows 2003 R2. This platform supports intel X86, Intel/AMD X64 and Intel Itanium plaftorms.
Systems based on the NT 6 code base include Windows Vista, Windows 7, Windows 2008 and Windows 2008 R2.
Most DBMS platforms are available on Windows, and some (particularly Microsoft SQL Server) are exclusively available on this platform.