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Beginning in September 2023, Windows Server has two primary release channels available: the Long-Term Servicing Channel (LTSC) and the Annual Channel (AC). The Long-Term Servicing Channel provides a longer-term option focusing on stability, whereas the Annual Channel provides more frequent releases. The Windows Server Semi-Annual Channel (SAC) was retired on August 9, 2022.

With the Long-Term Servicing Channel, a new major version of Windows Server is typically released every 2-3 years. The more frequent releases of the AC enable customers to take advantage of innovation more quickly, with a focus on containers and microservices. For a detailed comparison, see Windows Server servicing channels.

The focus on virtualization, container, and microservice innovation continues with Azure Stack HCI, Windows containers, and AKS on Azure Stack HCI.

Windows Server major versions by servicing option

(All dates are listed in ISO 8601 format: YYYY-MM-DD)

 Note

Windows Server is governed by the Fixed Lifecycle Policy. See the Windows Lifecycle FAQ and Comparison of servicing channels for details regarding servicing requirements and other important information. To learn more about Windows Server’s Lifecycle Policy, see a Windows Server Releases.

Windows Server release history

The table below shows the history of all monthly security and non-security preview updates released for Windows Server 2022. To see release notes and learn more about the contents of Windows Server 2022 updates, check Windows Server 2022 Update History.

For Windows Server 2016 and Windows Server 2019 release information, see Windows 10 - release information. Release notes for these versions are available on Windows Server 2016 update history and Server 2019 update history.