Extended Security Updates for Exchange Server 2016 and 2019 end on 31 October 2026
On 20 July 2026 the Exchange Server team answered a question a lot of IT departments had been quietly hoping to hear a different answer to. There will be no Period 3. Extended Security Updates for Exchange Server 2016 and 2019 end on 31 October 2026. Period 2 was the final window. It cannot be renewed or extended, and enrolled organizations get no further patches after that date, including for a critical vulnerability disclosed on 1 November. Roughly eight weeks from today. What Does the Period 2 ESU Actually Cover? Less than most people assume. Extended Security Updates deliver only