Microsoft Ends Support for Exchange 2016 and 2019 in October 2026

Microsoft has confirmed that the Extended Security Update (ESU) program for Exchange Server 2016 and 2019 will conclude in October 2026. This follows a six-month extension announced in April 2026. After this deadline, no security updates will be available for these legacy versions, which affects organizations still using these servers. IT administrators are advised to upgrade to Exchange Server Subscription Edition (SE) or Exchange Online to maintain security. The cessation of updates could leave systems vulnerable to attacks, as no further extensions will be granted. Microsoft has emphasized that this decision is final, urging users to migrate before the deadline. The original mainstream support for Exchange 2016 ended in October 2020, and for Exchange 2019, it ended in January 2024.

Key Points: • Microsoft will stop security updates for Exchange 2016 and 2019 after October 2026. • Organizations using these legacy servers are urged to upgrade to Exchange Server SE or Exchange Online. • No further extensions to the ESU program will be granted, increasing security risks for affected systems.