Microsoft Windows Server Release History
| Windows Server Version | Release Date | Support End Date |
| Windows Server 20H2 (SAC*) |
10/20/2020 | Mainstream support ended on May 10, 2022 |
| Windows Server 2004 (SAC*) | 05/27/2020 | Mainstream support ended on December 14, 2021 |
| Windows Server 1909 (SAC*) | 11/12/2019 | Mainstream support ended on May 11, 2021 |
| Windows Server 1903 (SAC*) | 5/21/2019 | Mainstream support ended on December 08, 2020 |
| Windows Server 2019 (LTSC *) | 11/13/2018 | Mainstream support ended on January 9, 2024 |
| Windows Server version 1809 (SAC*) |
11/13/2018 | Mainstream support ended on November 10, 2020 |
| Windows Server 2016 (LTSC *) | 12/10/2016 | Mainstream support ended on January 11, 2022 |
| Windows Server 2012 R2 (LTSC *) | 17/10/2013 | Mainstream support ended on October 9, 2018 Extended support ends on October 10, 2023 |
| Windows Server 2012 (LTSC *) | 4/09/2012 | Mainstream support ended on October 9, 2018 Extended support ends on October 10, 2023 |
| Windows Server 2008 R2 (LTSC *) | 22/10/2009 | Mainstream support ended on January 13, 2015 Extended support ended on January 14, 2020 |
| Windows Server 2008 (LTSC *) | 27/02/2008 | Mainstream support ended on January 13, 2015 Extended support ended on January 14, 2020 |
| Windows Server 2003 R2 (LTSC *) | 6/12/2005 | Mainstream support ended on July 13, 2010 Extended support ended on July 14, 2015 |
| Windows Server 2003 (LTSC *) | 24/04/2003 | Mainstream support ended on July 13, 2010 Extended support ended on July 14, 2015 |
| Windows 2000 | 17/02/2000 | Mainstream support ended on June 30, 2005 Extended support ended on July 13, 2010 |
| Windows NT 4.0 | 29/06/1996 | Mainstream support ended on December 31, 2002 Extended support ended on December 31, 200 |
| Windows NT 3.51 | 29/05/1995 | Unsupported as of December 31, 2001 |
| Windows NT 3.5 | 20/09/1994 | Unsupported as of December 31, 2001 |
| Windows NT 3.1 | 27/07/1993 | Unsupported as of December 31, 2000 |
* SAC – Semi-Annual Channel
Windows Server operating system releases under the Semi-Annual Channel are supported by Microsoft for 18 months. Microsoft targets two releases of Windows Server per year under this channel. These releases do not offer any GUI desktop environments, and include Server Core and Nano Server.
Operating systems from this channel are available as part of subscription services, including Software Assurance, Azure Marketplace, Visual Studio subscriptions, and others.
This channel includes the following versions:
Windows Server, version 1709
This version was originally available for Microsoft Software Assurance customers with an active Windows Server 2016 license.
Windows Server, version 1803
Windows Server, version 1809
Windows Server, version 1903
Windows Server, version 1909
Windows Server, version 2004
Windows Server, version 20H2
* LTSC – Long-Term Servicing Channel
Windows Server operating system releases under the Long Term Servicing Channel are supported by Microsoft for 10 years, with five years of mainstream support and an additional five years of extended support. These releases also offer a complete GUI desktop experience, along with GUI-less setups such as Server Core and Nano Server for releases that support them.
This channel includes the following operating systems:
Windows Server 2003
Windows Server 2003 R2
Windows Server 2008
Windows Server 2008 R2
Windows Server 2012
Windows Server 2012 R2
Windows Server 2016
Windows Server 2019
Windows Server 2022 (In preview)
