Windows Server Extended Security Updates (ESU) offer continued security patching for Windows Server versions that have reached their end of support (EOS). This program is designed to help organizations maintain critical security compliance while transitioning to newer versions of Windows Server or migrating workloads to Microsoft Azure. <br/> ESU provides critical and important security updates for up to three years beyond the EOS date, ensuring that vulnerable systems remain protected from evolving threats. The updates include patches for vulnerabilities identified in Microsoft's Common Vulnerabilities and Exposures (CVE) list. <br/> Organizations can purchase ESU annually, with discounts available for those migrating workloads to Azure, where extended security updates are offered for free. ESU applies to versions like Windows Server 2008, 2008 R2, 2012, and 2012 R2. <br/>