Windows Server 2019 and later) Semi-annual releases (discontinued) Following the release of Windows Server 2016, Microsoft attempted to mirror the lifecycle of Windows 10 in the Windows Server family, releasing new versions twice a year which were supported for 18 months. These semi-annual versions were only available as part of Microsoft subscription services, including Software Assurance, Azure Marketplace, and Microsoft Visual Studio subscriptions, until their discontinuation in July 2021. The semi-annual releases do not include any desktop environments. Instead, they are restricted to the Nano Server configuration installed in a Docker container, and the Server Core configuration, licensed only to serve as a container host. Semi-annual releases include: Windows Server, version 1709 (unsupported as of ) Windows Server, version 1803 (unsupported as of ) Windows Server, version 1809 (unsupported as of ) Windows Server, version 1903 (unsupported as of ) Windows Server, version 1909 (unsupported as of ) Windows Server, version 2004 (unsupported as of ) Windows Server, version 20H2 (unsupported as of ) See also List of Microsoft Windows versions Microsoft Servers NetWare Open Enterprise Server References External links Windows Server Windows NT