No Skype for Business Server Security Updates for January 2026

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 January 2026, for customers with SfB 2015/SfB 2019 ESU, or SfB SE. 

Please keep upgrading your organizations to Skype for Business SE.

The Skype for Business Team