Microsoft Windows Server Extended Security Update (ESU) Explained
25-09-2026 14:54Microsoft provides a fixed support lifecycle for its on-premises software products, including SQL Server and Windows Server. Windows Server 2016 became generally available on October 15, 2016. During the first five years of its lifecycle, Microsoft provides mainstream support. The following five years are covered by extended support, which primarily includes security updates. After approximately ten years, all support ends. For Windows Server 2016, extended support ends on January 12, 2027. For the most current lifecycle information, refer to the official Microsoft documentation. Organizations that continue running Windows Server 2016 after January 12, 2027 face increased security and compliance risks because they will no longer receive security updates. To address this, Microsoft offers Extended Security Updates (ESU). The question many customers ask is: how are ESUs licensed?