Microsoft has reminded that Exchange Server 2016 and 2019 have reached end of support and advised IT administrators to upgrade the servers to Exchange Server SE or migrate to Exchange Online.
According to Redmond’s product lifecycle website, Exchange 2016 mainstream support Expired in October 2020, while Exchange 2019 reached its end of mainstream support in January 2024.
The company also reminded customers in January and September that Exchange Server 2016 and 2019 will reach end of support this month.
After October 2025 Exchange Server Security UpdateMicrosoft will stop releasing time zone updates and security patches to address vulnerabilities that could expose servers to breaches.
It will also stop providing technical support, including bug fixes for newly discovered issues that may affect the stability and usability of older servers.
“Today, October 14, 2025, Exchange Server 2016 and Exchange Server 2019 have reached end of support. It’s important to upgrade now to remain supported and secure,” the Exchange team said in a statement. tuesday blog post,
“Customer installations of Exchange 2016 and Exchange 2019 will continue to run after October 14, 2025. However, continuing to use these offerings after the end of support date invites potential security risks, so we strongly recommend taking action now.”
Upgrade or migrate
Microsoft advised administrators Migrate to Exchange Online (available as a standalone service or as an Office 365 subscription) or Upgrade to Exchange Server Subscription Edition (SE),
As the company explained, they can upgrade in place From Exchange Server 2019 to Exchange Server SE, a process similar to installing cumulative updates (CU).
Administrators who still have servers running Exchange 2016 or 2013 are advised to upgrade to Exchange Server SE or install Exchange 2019 first.
you can find detailed Microsoft 365 migration Guidance for global administrators on Microsoft’s documentation site, which can also help make the best decision Exchange Online Migration Path,
“We strongly believe that fully migrating to Exchange Online or Microsoft 365 provides customers with the best value and user experience. Migrating to the cloud is the best and simplest option to help you retire your Exchange Server deployment,” Microsoft said today.
“When you migrate to Microsoft Cloud, you move straight away from on-premises deployment and benefit from new features and technologies, including advanced generative AI techniques that are available in the cloud but not on-premises.”
Microsoft also reminded customers that Windows 10 has reached end of support today and will no longer release patches for newly discovered Windows 10 security vulnerabilities.
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