Although Exchange 2016 and 2019 are now out of support, some customers have purchased the Exchange 2016 and 2019 Extended Security Update (ESU). We have therefore decided that until the end of this Exchange 2016 and 2019 ESU period (April 2026) we will make an explicit update related announcement even if we DO NOT release anything for that particular month.
There are no security releases for any version of Exchange Server in January 2026, for customers with Exchange SE, or Exchange 2016 or 2019 ESU.
Please keep upgrading your organizations to Exchange SE.
The Exchange Team
Published Jan 13, 2026
Version 1.0