Copilot Chat comes to the Microsoft 365 apps
September 16, 2025T-1 month: Exchange Server 2016 and Exchange Server 2019 End of Support
September 16, 2025
September 14, 2025
On October 14, 2025, one month from now, Skype for Business Server 2015, Skype for Business Server 2019, Skype for Business 2016 (client), and Skype for Business 2019 (client) reach end of support. It’s therefore critical to upgrade now to remain supported and secure.
After October 14, 2025, Microsoft will no longer provide technical support, meaning some problems may occur with these products. Users will no longer receive:
- Bug fixes for issues that may impact the stability and usability of the server or clients.
- Security fixes for vulnerabilities that may make the server or clients vulnerable to security breaches.
Customer installations of Skype for Business Server 2015 and Skype for Business Server 2019 and clients running Skype for Business 2016 and Skype for Business 2019 will continue to run after October 14, 2025. However, continuing to use these offerings after the end-of-support date invites potential future security risks, so we strongly recommend taking immediate action.
Our recommendation is to migrate to Microsoft Teams or upgrade your organization to Skype for Business Server Subscription Edition (SE).
Migrate to Microsoft Teams
Customers get the best value and user experience by migrating from Skype for Business Server to Microsoft Teams. Migrating to Microsoft Teams is the best and simplest option to help you retire your Skype for Business Server deployment.
When you migrate to Microsoft Teams, you make a straightforward hop away from an on-premises deployment and benefit from new features and technologies, including advanced generative AI technologies that provide meeting summaries, that are available in the cloud but not on-premises.
If you’re migrating to Microsoft 365, you might be eligible to use our Microsoft FastTrack service. FastTrack shares best practices and provides tools and resources to make your migration to Microsoft 365 as seamless as possible. Best of all, you’ll have a support engineer helping you, from planning and designing to migrating your last mailbox. For more information about FastTrack, see Microsoft FastTrack.
Prepare to Upgrade to Skype for Business Server SE
In July 2025, we announced the general availability of Skype for Business Server SE with details on how to upgrade if you intend to continue to run Skype for Business Server on-premises.
- If you are running Skype for Business Server 2019, we recommend that you upgrade in-place to Skype for Business Server SE.
- If you are running Skype for Business Server 2015, we recommend that you perform a legacy (a.k.a. side-by-side) upgrade to Skype for Business Server SE.
Skype for Business Technology Adoption Program
If your organization intends to continue running Skype for Business Server and you want to test and evaluate pre-release builds of Skype for Business Server SE, you can apply to join the Skype for Business Technology Adoption Program (TAP).
Joining the TAP has several advantages, such as the ability to provide input and feedback on future updates, develop a close relationship with the Skype for Business engineering team, receive pre-release information about Skype for Business, and more. TAP members also get support from Microsoft at no additional charge for issues related to the TAP.
All nominations are reviewed and screened prior to acceptance. No customers are allowed access to any pre-release downloads or information until all legal paperwork is properly executed. Nomination does not mean acceptance, as not all nominees will be chosen for the TAP. If you are preliminarily accepted, we will contact you to get the required paperwork started.
Related Microsoft Products Reaching End of Support on October 14, 2025
In addition to the above Skype for Business products, several other products (some of which are often used with Skype for Business) also reach end of support or retirement on October 14, 2025, including Exchange Server 2016, Exchange Server 2019, Microsoft Office 2016, Microsoft Office 2019, Outlook 2016, Outlook 2019, Windows 10, and more.
You can search product and services lifecycle information to get detailed information for your Microsoft products and services.
– Skype for Business Server Engineering Team