Exchange 2016 and 2019 End of Life and Some Interesting Exchange Online Developments

Exchange SE and Exchange Online News October 2025

On Oct 14, 2025, Exchange 2019 and 2016 reach end-of-life and Exchange SE becomes the only supported on-premises Exchange server. In other news, we discuss Microsoft guidance for moving to cloud first identity, HVE and ECS and the extension of basic authentication support to September 2028, the introduction of auto-archiving for Exchange Online, and why Microsoft is deprecating the Contact object from Exchange Online.

Microsoft Introduces Exchange 2016/2019 Extended Security Program

Exchange Extended Security Update program

The Exchange Extended Security Update program is a 6-month lifeline for organizations struggling to upgrade servers to Exchange Server SE. Although it’s easy to upgrade a server to , many things might get in the way before the Setup program can run. Small things like vacations, buying new hardware, or deploying a new O/S. From August 1, organizations can sign up to receive security updates from October 2025 to April 2026.