Microsoft to stop Exchange 2016 / 2019 security updates in October

Microsoft has announced that the Extended Security Update (ESU) program for Exchange Server 2016 and 2019 will end in October 2026, with no further extensions. After this date, no security updates will be provided, leaving unpatched systems vulnerable to exploitation. Organizations are advised to upgrade to Exchange Server Subscription Edition or migrate to Exchange Online to maintain security and support.

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