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The 2025 H1 Cumulative Update (CU15) for Exchange Server 2019 has been released, marking the final update for the application which reaches its end of life on October 14, 2025. Microsoft cited necessary security work for the delay. CU15 is essential for hybrid configurations and cloud archives support. It introduces Exchange Server Feature Flighting, enabling quicker deployment of updates. Microsoft emphasized the importance of testing updates in a non-production environment, although this process may slow down the deployment of important fixes. CU15 also includes partial TLS 1.3 support and the option to collect diagnostic data.

The final cumulative update for Exchange Server 2019 is here