Windows Server 2016 reaches end of support on January 12, 2027, after which it gets no security updates, bug fixes or technical support. Microsoft’s recommended path is upgrading to Windows Server 2025, with Extended Security Updates available as a paid bridge for up to three years if you can’t migrate in time. Pricing and purchase details for Windows Server 2016 ESUs haven’t been published yet — Microsoft says they’re coming in the next few months — so if you expect to need them, confirm availability and cost with your partner before budgeting.
Source: Microsoft Windows IT Pro Blog — Windows Server 2016 end of support ↗