Operating systems must be supported by the vendor which means regular security updates must be provided in order to fix security issues.
Whilst every effort is made to provide the most up-to-date information, you should always check the vendor site for the support status of your particular operating system.
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Windows Server Windows server editions typically have a ten year lifecycle. The first five years is mainstream support, the second five years are extended support. A server operating system is compliant if it is in either mainstream or extended support. End of mainstream support End of extended support Server 2022 13-10-2026 14-10-2031 Server 2019 09-01-2024 09-01-2029 Server 2016 11-01-2022 12-01-2027 Server 2012 09-10-2018 10-10-2023 Extended security update program Extended security updates (ESU) are supplied by Microsoft at their discretion and you should check with Microsoft if they are available and under what terms. Please note this should be considered a last resort and the preferred option should be to upgrade to a version in mainstream or extended support. https://www.microsoft.com/en-us/windows-server/extended-security-updates Vendor information