Exchange Server 2016 and 2019 End-of-Life is October 14 2025: Time to Decide Your Next Steps

Microsoft has put administrators on notice: the clock is ticking for Exchange Server 2016 and 2019. Support for both versions officially ends on October 14, 2025. As confirmed by recent reports in publications like The Register and Computerworld, this means no more updates, technical support, bug fixes, or crucial security patches after that date.

Adding to the urgency, Microsoft released the final cumulative update (CU15) for Exchange Server 2019 in February 2025, signaling the final stages before support cessation.

The Tight Timeline for On-Premises Upgrades

For organizations planning to stay with an on-premises solution, Microsoft is preparing Exchange Server Subscription Edition (SE), slated for release around July 2025. However, this leaves an extremely narrow window – barely three months – for IT departments to plan, procure, install, and migrate before the October 14th EOL deadline for Exchange 2016/2019.

A Fundamental Shift: Subscription Licensing for On-Premises Exchange

Crucially, Exchange Server SE marks a significant departure from the traditional perpetual licensing model. Like SharePoint Server SE, the new Exchange Server SE will require customers to purchase annual subscription licenses (or maintain Software Assurance) to receive ongoing updates and security fixes. This move aligns Exchange Server more closely with Microsoft's cloud-first strategy and introduces a recurring cost for organizations choosing to remain on-premises.

Your Options as the Deadline Approaches

With the end-of-life date looming and the final patch released, Microsoft customers running Exchange Server 2016 or 2019 must make a decision:

1. Migrate to the Cloud: Migrate to the Cloud: Move to the fully hosted Exchange Online or Microsoft 365 platform.

2. Upgrade On-Premises: Upgrade On-Premises: Prepare for a rapid migration to Exchange Server SE (Subscription Edition) upon its release in July, accepting the new subscription licensing model.

3. Seek Alternatives: Seek Alternatives: Explore other on-premises or hosted email server solutions.

Consider MailSite as Your Exchange Alternative

For organizations seeking a robust, cost-effective on-premises alternative, MailSite offers a compelling solution. MailSite provides much of the core functionality found in Microsoft Exchange but at a fraction of the price. Furthermore, it is known for its significantly simpler installation and administration experience.

If the complexities of the upcoming Exchange SE migration, the shift to subscription licensing, or a move to the cloud aren't the right fit for your organization, now is an excellent time to evaluate MailSite.

Special Offer: If the complexities of the upcoming Exchange SE migration, the shift to subscription licensing, or a move to the cloud aren't the right fit for your organization, now is an excellent time to evaluate MailSite.Customers migrating from Microsoft Exchange to MailSite can benefit from special promotional pricing available until September 2025.

Contact sales@mailsite.com for more information and to discuss your migration path.