Windows Server (formerly Windows NT Server) is a group of operating systems (OS) for servers by Microsoft. The brand name was changed to Windows Server in 2003.
| Release | Released | Active Support | Security Support | Extended Security Updates | Latest |
|---|---|---|---|---|---|
| Windows Server 2025 (LTSC) | 8 months ago (01 Nov 2024) |
Ends
in 4 years (09 Oct 2029)
|
Ends
in 9 years (10 Oct 2034)
|
Unavailable | 10.0.26100 |
| Windows Server 23H2 AC | 1 year and 9 months ago (24 Oct 2023) |
Ended
2 months and 4 weeks ago (24 Apr 2025)
|
Ends
in 3 months (24 Oct 2025)
|
Unavailable | 10.0.25398 |
| Windows Server 2022 (LTSC) | 3 years and 11 months ago (18 Aug 2021) |
Ends
in 1 year and 2 months (13 Oct 2026)
|
Ends
in 6 years (14 Oct 2031)
|
Unavailable | 10.0.20348 |
| Windows Server 20H2 SAC | 4 years and 9 months ago (20 Oct 2020) |
Ended
2 years and 11 months ago (09 Aug 2022)
|
Ended
2 years and 11 months ago (09 Aug 2022)
|
Unavailable | 10.0.19042 |
| Windows Server 2004 SAC | 5 years ago (27 May 2020) |
Ended
3 years and 7 months ago (14 Dec 2021)
|
Ended
3 years and 7 months ago (14 Dec 2021)
|
Unavailable | 10.0.19041 |
| Windows Server 1909 SAC | 5 years and 8 months ago (12 Nov 2019) |
Ended
4 years ago (11 May 2021)
|
Ended
4 years ago (11 May 2021)
|
Unavailable | 10.0.18363 |
| Windows Server 1903 SAC | 6 years ago (21 May 2019) |
Ended
4 years and 7 months ago (08 Dec 2020)
|
Ended
4 years and 7 months ago (08 Dec 2020)
|
Unavailable | 10.0.18362 |
| Windows Server 1809 SAC | 6 years and 8 months ago (13 Nov 2018) |
Ended
4 years and 8 months ago (10 Nov 2020)
|
Ended
4 years and 8 months ago (10 Nov 2020)
|
Unavailable | 10.0.17763 |
| Windows Server 2019 (LTSC) | 6 years and 8 months ago (13 Nov 2018) |
Ended
1 year and 6 months ago (09 Jan 2024)
|
Ends
in 3 years and 5 months (09 Jan 2029)
|
Unavailable | 10.0.17763 |
| Windows Server 1803 SAC | 7 years ago (30 Apr 2018) |
Ended
5 years and 8 months ago (12 Nov 2019)
|
Ended
5 years and 8 months ago (12 Nov 2019)
|
Unavailable | 10.0.17134 |
| Windows Server 1709 SAC | 7 years ago (17 Oct 2017) |
Ended
6 years ago (09 Apr 2019)
|
Ended
6 years ago (09 Apr 2019)
|
Unavailable | 10.0.16299 |
| Windows Server 2016 (LTSC) | 8 years ago (15 Oct 2016) |
Ended
3 years and 6 months ago (11 Jan 2022)
|
Ends
in 1 year and 5 months (12 Jan 2027)
|
Unavailable | 10.0.14393 |
| Windows Server 2012 R2 (LTSC) | 11 years ago (25 Nov 2013) |
Ended
6 years and 9 months ago (09 Oct 2018)
|
Ended
1 year and 9 months ago (10 Oct 2023)
|
Ends
in 1 year and 2 months (13 Oct 2026)
|
6.3.9600 |
| Windows Server 2012 (LTSC) | 12 years ago (30 Oct 2012) |
Ended
6 years and 9 months ago (09 Oct 2018)
|
Ended
1 year and 9 months ago (10 Oct 2023)
|
Ends
in 1 year and 2 months (13 Oct 2026)
|
6.2.9200 |
| Windows Server 2008 R2 SP1 (LTSC) | 14 years ago (22 Feb 2011) |
Ended
10 years ago (13 Jan 2015)
|
Ended
5 years ago (14 Jan 2020)
|
Ended
2 years and 6 months ago (10 Jan 2023)
|
6.1.7601 |
| Windows Server 2008 SP2 (LTSC) | 16 years ago (29 Apr 2009) |
Ended
10 years ago (13 Jan 2015)
|
Ended
5 years ago (14 Jan 2020)
|
Ended
2 years and 6 months ago (10 Jan 2023)
|
6.0.6003 |
| Windows Server 2003 SP2 (LTSC) | 18 years ago (13 Mar 2007) |
Ended
15 years ago (13 Jul 2010)
|
Ended
10 years ago (14 Jul 2015)
|
Unavailable | 5.2.3790 |
| Windows Server 2003 SP1 | 20 years ago (30 Mar 2005) |
Ended
16 years ago (14 Apr 2009)
|
Ended
16 years ago (14 Apr 2009)
|
Unavailable | 5.2.3790 |
| Windows Server 2003 (LTSC) | 22 years ago (24 Apr 2003) |
Ended
18 years ago (10 Apr 2007)
|
Ended
18 years ago (10 Apr 2007)
|
Unavailable | 5.2.3790 |
| Windows Server 2000 (LTSC) | 25 years ago (17 Feb 2000) |
Ended
20 years ago (30 Jun 2005)
|
Ended
15 years ago (13 Jul 2010)
|
Unavailable | 5.0.2195 |
Servicing channels
There have been historically three primary release channels available:
- Long-Term Servicing Channel (LTSC)
- Semi-Annual Channel (SAC)
- Annual Channel (AC)
The Windows Server Semi-Annual Channel (SAC) was retired on August 9, 2022. There will be no future SAC releases of Windows Server.
The Windows Server Annual Channel (AC) was released after the retirement of the Semi-Annual Channel (SAC). The first release of the Annual Channel (AC) was on October 24, 2023.
Long-Term Servicing Channel (LTSC)
With the Long-Term Servicing Channel, a new major version of Windows Server is released every 2–3 years. Users are entitled to 5 years of mainstream support and 5 years of extended support. The Long-Term Servicing Channel will continue to receive security and non-security updates, but it will not receive the new features and functionality.
Semi-Annual Channel (SAC)
Each release in this channel is supported for 18 months from the initial release. Most of the features introduced in the Semi-Annual Channel have been rolled up into the next Long-Term Servicing Channel release of Windows Server. In this model, Windows Server releases were identified by the year and month of release: for example, in 2017, a release in the 9th month (September) would be identified as version 1709. Fresh releases of Windows Server in the Semi-Annual Channel occur twice a year. The support lifecycle for each release is 18 months. Starting with the fall 2020 (20H2) releases, the identification changed. Instead of a month, the release is named based on the release cycle. For example, version 20H2, for a release in the second half of the year 2020.
Annual Channel (AC)
Similar to Semi-Annual Channel (SAC), but releases occurred every 12 months. The support lifecycle for each release is 18 months of mainstream support, plus 6 months of extended support.
Extended Security Updates (ESU)
For some releases, customers also have the option to purchase Extended Security Updates (ESU). It includes Critical and/or Important security updates for a maximum of three years after the product’s End of Extended Support date. Customers can also get technical support for the ESU period as long as they also have an active support plan.
More information is available on the Microsoft Windows Server website.
You should be running one of the supported release numbers listed above in the rightmost column.
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