On Monday, Microsoft released the last major update for Exchange Server 2019. The aging Exchange Server is set to lose support on Oct. 14, 2025. This final update 2025 H1 Cumulative Update CU15 introduces new features, security enhancements and compatibility updates, while also providing hooks for Microsoft upcoming Exchange Server Subscription Edition SE. One highlight of this final CU is the introduction of Feature Flighting, a cloud based service for Exchange Server Subscription Edition S
