Summary
Windows Server (formerly Windows NT Server) is a group of operating systems (OS) for servers that Microsoft has been developing since July 27, 1993. The first OS that was released for this platform is Windows NT 3.1 Advanced Server. With the release of Windows Server 2003, the brand name was changed to Windows Server. The latest release of Windows Server is Windows Server 2022, which was released in 2021. Microsoft's history of developing operating systems for servers goes back to Windows NT 3.1 Advanced Server. Windows 2000 Server is the first OS to include Active Directory, DNS Server, DHCP Server, and Group Policy. Main releases include: Windows NT 3.1 Advanced Server (July 1993) Windows NT Server 3.5 (September 1994) Windows NT Server 3.51 (May 1995) Windows NT 4.0 Server (July 1996) Windows 2000 Server (December 1999) Windows Server 2003 (April 2003) Windows Server 2003 R2 (December 2005) Windows Server 2008 (February 2008) Windows Server 2008 R2 (October 2009) Windows Server 2012 (September 2012) Windows Server 2012 R2 (October 2013) Windows Server 2016 (October 2016) Windows Server 2019 (October 2018) Windows Server 2022 (August 2021) Traditionally, Microsoft supports Windows Server for 10 years, with five years of mainstream support and an additional five years of extended support. These releases also offer a complete desktop experience. Starting with Windows Server 2008 R2, Server Core and Nano Server configurations were made available to reduce the OS footprint. Between 2015 and 2021, Microsoft referred to these releases as "long-term support" releases to set them apart from semi-annual releases (see below.) For sixteen years, Microsoft released a major version of Windows Server every four years, with one minor version released two years after a major release. The minor versions had an "R2" suffix in their names. In October 2018, Microsoft broke this tradition with the release of Windows Server 2019, which should have been "Windows Server 2016 R2". Windows Server 2022 is also a minor upgrade over its predecessor.
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