In early 2022, we announced changes to our servicing model for Exchange Server that moved to a servicing cadence of two Cumulative Updates (CUs) per year, releasing in H1 and H2 of each calendar year, with general target release dates of March and September. Our release dates are driven by the payload and quality, and other work that might take priority, such as releasing a security update (SU).
In our last roadmap update, we said that the final CU for Exchange Server 2019—the H2 2024 CU aka CU15—would be released later this year.
Today, we’re announcing that the final CU for Exchange Server 2019 will be the H1 2025 CU (still CU15, though), and we will release it in early January of 2025 (Edit 2/10/2025: CU15 has now been released). We took a similar approach last year and the year before.
In the meantime, we recommend all customers update to the v2 version of the November 2024 SU, and perform the manual workaround for the known time zone issue. After that, download and run the latest release of the Exchange Server HealthChecker and verify that no issues exist.
Finally, some things to keep in mind:
- We are not changing any of our lifecycle dates.
- This has no effect on the timing of the RTM release of Exchange Server SE, which is still expected in early H2 of CY25.
- Our guidance for all customers remains the same: get to Exchange Server 2019, install the latest update, and upgrade in-place to Exchange Server SE when available.
Exchange Server Team
Updated Feb 10, 2025
Version 3.0The_Exchange_Team
Microsoft
Joined April 19, 2019
Exchange Team Blog
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