No Skype for Business Server Security Updates for November 2025

Although Skype for Business 2015 and 2019 are now out of support, some customers have purchased the Skype for Business 2015 and 2019 Extended Security Update (ESU). We have therefore decided that until the end of this Skype for Business 2015 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 Skype for Business Server in November 2025, for customers with SfB SE, or SfB 2016 or 2019 ESU. 

Please keep upgrading your organizations to Skype for Business SE.

The Skype for Business Team