Update 7/15/2025: Added a mention of Exchange 2016/2019 ESU program.
In May 2024, we shared our Exchange Server Roadmap Update and our plans for the future of Exchange Server. Since then, we’ve bee...
Updated Aug 13, 2025
Version 17.0
Blog Post
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Release Details
To allow for rapid adoption and deployment, the RTM release of Exchange Server SE will be code equivalent to (e.g., the same exact code as) Exchange Server 2019 CU15, except for the following changes:
- The License agreement, an RTF file shown only in the GUI version of Setup, will be updated.
- The name will change from Microsoft Exchange Server 2019 to Microsoft Exchange Server Subscription Edition.
- The build and version number will be updated.
Please note that:
- If any Security Updates (SUs) are released before CU15, those updates will be incorporated into CU15.
- If any SUs are released after CU15, then the RTM release of Exchange Server SE will be code equivalent to Exchange 2019 CU15 plus the latest SU. If you are on CU15, which is where you should be, then you should also be already running the latest SU released after CU15, thereby maintaining code equivalence with the RTM release."