On February 17, 2000 (January 13, 2000 in the lunar calendar), Microsoft released Windows 2000. Windows 2000 is part of Microsoft's Windows NT product line. It was released on February 17, 2000. It is a business-oriented operating system. Windows 2000 can run on single-processor systems or multi-processing systems. In addition, Windows 2000 is also the predecessor of Windows XP and Windows2003. Microsoft claims Windows 2000 is the most secure Windows operating system they have ever released. Windows 2000 is also considered the best version of Windows.