Announcing “Period 2” for Skype for Business Server 2015/2019 Extended Security Update (ESU) Program

While both Skype for Business (SfB) Server 2015 and 2019 have been out of Support since October 2025 , some of our customers who needed more time to finalize migrations to SfB Server Subscription Edition (SE) or to Teams opted to enroll into the Extended Security Update program . That ESU program started in October 2025, and is concluding at the end of April 2026. As the end of ESU draws near, some of our customers told us that they will need additional time to finalize their SfB Server…