Microsoft is once again reminding administrators that Exchange Server 2016 and Exchange Server 2019 will reach their end of extended support next month. The company’s official product lifecycle website shows that mainstream support for these versions has already ended, but a final deadline is approaching for all support.
After October 14, 2025, Microsoft will stop providing technical support for these servers. This means there will be no more security fixes for vulnerabilities or bug fixes for any newly discovered issues that could affect the stability or security of these outdated servers. Although the servers will continue to run, using them after the end-of-support date poses a significant security risk, and Microsoft strongly urges administrators to act now.
To remain supported and secure, Microsoft recommends that administrators either migrate to Exchange Online or upgrade to Exchange Server Subscription Edition (SE). For those currently running Exchange Server 2019, the upgrade to Exchange Server SE can be done in-place, which is similar to installing a standard Cumulative Update.
If you are using Exchange 2016, Microsoft advises performing a side-by-side upgrade to Exchange Server SE. For organizations still running Exchange Server 2013 or earlier, those servers must be removed first before they can install Exchange Server 2019 CU15 or upgrade to Exchange Server SE. Microsoft has provided detailed migration guidance and resources to help global administrators choose the best path forward.
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