Microsoft has reminded customers that it will stop shipping security updates for Exchange 2016 and 2019 through the Extended Security Update (ESU) program in October.
This comes after a 6-month extension announced in April 2026 to the original ESU program, which began in October after Exchange Server 2016 and 2019 reached the end of support.
Exchange 2016 reached mainstream support in October 2020, while Exchange 2019 mainstream support ended in January 2024.
"Over the last several weeks we have received several questions about possible extension of the Exchange Server 2016/2019 ESU program past October 2026," the Exchange Server team said in a Monday blog post.
"After all, in our original Exchange 2016/2019 ESU announcement we said that there would be no extensions, but then we ended up creating a Period 2 Exchange ESU program that is scheduled to end with October 2026. We are just about at the mid-point of Period 2 Exchange ESU now.
