Windows 2000 came before Windows XP.
Windows 2000, also known as Windows NT 5.0, was Microsoft's business-oriented operating system released on February 17, 2000. It was designed for professional and server environments, succeeding Windows NT 4.0. It served as the primary OS until the arrival of Windows XP in 2001. Windows 2000 received four official service packs throughout its lifespan to improve stability and security.
In summary, Windows 2000 was the direct predecessor to the widely successful Windows XP.
