
Microsoft has announced that Exchange Server 2016 and 2019 will reach their end of extended support on October 14, 2025. This critical milestone requires immediate attention from system administrators and organizations still utilizing these platforms.
Key Impact Points:
– Technical support discontinuation
– No further bug fixes or security updates
– Time zone updates will cease
– Increased security vulnerability risks
Migration Options:
1. Exchange Online
– Available via Office 365 subscription
– Standalone service option
2. Exchange Server Subscription Edition (SE)
– Expected release: Early H2 2025
– Supports in-place upgrades from Exchange 2019
– Similar to Cumulative Update installation process
Transition Strategy:
Microsoft has streamlined the upgrade path to Exchange Server SE by:
– Including essential features in Exchange Server 2019 CU15
– Reserving new features for Exchange Server SE CU1
– Implementing RTM as a branding update with new lifecycle policies
Important Note:
While existing installations will continue functioning post-October 2025, Microsoft strongly recommends immediate action to mitigate potential security risks. Detailed migration guidance is available through Microsoft’s documentation site for global administrators.