Release Date: February 20, 2025
Bulletin ID: Exchange 2016 and 2019 End of Support
Severity: Advisory
Impact: Security Risks, Lack of Support
Summary
Microsoft has announced the End of Support (EOS) for Exchange Server 2016 on October 14, 2025. Exchange Server 2019 remains the last on-premises version of Exchange, but customers should be aware of lifecycle policies and support timelines to ensure security and compliance.
After the EOS date, Exchange Server 2016 will no longer receive security updates, bug fixes, or technical support, which could leave organizations vulnerable to security threats and compliance issues.
Organizations should take proactive steps to plan their migration strategy to ensure continued security and support.
Next Steps for Customers
- Migrate to Exchange Online (Recommended)
Microsoft recommends migrating to Exchange Online as part of Microsoft 365. This ensures:
- Automatic updates and security patches
- Lower maintenance overhead
- Cloud-based collaboration and enhanced security features
- Upgrade to Exchange Server Subscription Edition (If Remaining On-Premises)
- Exchange Server 2019 is the last on-premises version of Exchange Server.
- Microsoft has announced a Subscription-Based Exchange Server, which will be required for organizations that need to remain on-premises beyond 2025.
- Customers should plan to upgrade from Exchange 2016 or 2019 to this edition once available.
- Apply Extended Security Updates (ESU) if Necessary
For organizations that cannot complete their migration by October 2025, Microsoft may provide Extended Security Updates (ESU) at an additional cost. This should be considered as a last resort.
Action Required: Begin planning now to migrate or upgrade before security patches end.
For more details, visit Microsoft’s official Exchange support page.
For assistance, contact your Managed Service Provider or Microsoft Partner for guidance on migration strategies.