It was the direct successor to Windows NT 4.0, and was released to manufacturing on December 15, 1999, and was officially released to retail on Februand Septemfor Windows 2000 Datacenter Server. Windows 2000 is a major release of the Windows NT operating system developed by Microsoft and designed for businesses. Mainstream support ended on June 30, 2005 windows2000/ at the Wayback Machine (archived December 3, 2000) IA-32 (including PC-98) ( Alpha in alpha, beta, and release candidate versions) Service Pack 4 with Update Rollup () / September 13, 2005 18 years ago ( ) Source-available (through Shared Source Initiative).
