We wanted to write an article related to a very frequent customer question related to Exchange Server 2019 to Exchange Server Subscription Edition (SE) migration.
As we mentioned in Upgrading your ...
Updated May 02, 2025
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So, we have four servers, EXC 2019 Cu 15, and a total of 60 db. We're also in a hybrid configuration. Will we have problems with the SE migration to 60 db? So, will we need to enter a product key? Also, will our hybrid configuration be affected? What would be your recommendation for hybrid?
- Nino_Bilic
Microsoft
Simply use the same process that you use when installing any CU on Exchange 2019 to in-place upgrade to Exchange SE RTM. Nothing special needed. No impact to hybrid. It is literally just like a CU for Exchange 2019.
Hi Nino,
Thank you for your recent comment on the ESU program. I wanted to seek some clarification regarding our specific situation. Our customer is a bank, and they can now see Exchange SE in their Open Value Agreement. They are concerned about the need for a six-month ESU, as their support will end on October 14, 2025.
In our country, there is no direct Microsoft presence, and all Microsoft business is managed by a Commercial Distributor and CSP in Direct Provider. The customer’s new hardware is scheduled to arrive in December, and they plan to upgrade to SE on the new hardware in January 2026. Therefore, they are worried about the period from October to January.
Could you please provide some guidance on how we can address this concern?
Hi Microsoft team- Waiting to hear from you on above query
Thanks for respond
Does the upgrade from Exchange 2019 CU15 to SE require a schema update to AD? Thanks!!
- LukasSMSFT
No, it doesn't require a schema update from Exchange 2019 CU15 -> Exchange Server SE RTM. See: https://learn.microsoft.com/en-us/exchange/plan-and-deploy/prepare-ad-and-domains#exchange-active-directory-versions
