Microsoft Ends Support for Exchange & Skype for Business Servers: What You Need to Know

Microsoft has announced a critical update regarding the support lifecycle of its Exchange Server and Skype for Business products. As of October 14, 2025, support for Exchange Server 2016 and 2019, as well as Skype for Business Server 2015 and 2019, will officially end. To assist organizations in transitioning to newer platforms, Microsoft is offering a one-time, six-month Extended Security Update (ESU) program, extending support until April 14, 2026. (techradar.com)
Understanding the Extended Security Update (ESU) Program
The ESU program is designed to provide critical and important security updates for organizations that need additional time to complete their migration processes. Key details include:

• Duration: October 14, 2025, to April 14, 2026.
• Availability: ESUs will not be available via Windows Update or public downloads. Organizations must enroll in the program to receive updates.
• Enrollment: Starting August 1, 2025, customers can contact Microsoft for pricing and purchase details.

It's important to note that this ESU is not an extension of the support lifecycle but a temporary measure to aid in migration efforts. (techradar.com)
Migration Recommendations
Microsoft strongly recommends that organizations complete their migrations to Exchange Server Subscription Edition (SE) or Skype for Business Server SE before the end of support date. The ESU is intended as a last resort for those unable to finalize their migrations in time. (techradar.com)
Implications for Organizations
Continuing to use Exchange Server 2016/2019 or Skype for Business Server 2015/2019 beyond the support period without enrolling in the ESU program poses significant security risks. Organizations are urged to assess their current infrastructure and develop a migration plan promptly to ensure continued security and compliance.
Conclusion
Microsoft's provision of a six-month ESU offers a critical buffer for organizations in the process of migrating to newer platforms. However, this extension is finite, and proactive planning is essential to maintain secure and supported communication infrastructures.

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Source: inkl Microsoft extends support for Exchange, Skype business servers - here's how to keep access