Decommission Exchange 2013 - Move to EXO

Brandon Epler 0 Reputation points
2023-04-13T18:11:58.1966667+00:00

I am reaching out to the community as Microsoft has ended support two days ago for any help / guidance with Exchange Server 2013. We are looking to remove all the local Exchange servers (we have server roles for CAS and MBX). From what I've already read through on other threads, is that we need to remove the DAG and any associated mailboxes that exist on-prem. However, I don't have clarity on if having CAS and MBX not on the same server poses a problem from the MS comment "Do not uninstall the last server" (https://learn.microsoft.com/en-us/exchange/manage-hybrid-exchange-recipients-with-management-tools). Does it matter which server is the "last" server part of Exchange. There is another server that I plan to have for recipient management (Exchange Server 2019 Tools).

Microsoft Exchange Online Management
Microsoft Exchange Online Management
Microsoft Exchange Online: A Microsoft email and calendaring hosted service.Management: The act or process of organizing, handling, directing or controlling something.
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Exchange Server Management
Exchange Server Management
Exchange Server: A family of Microsoft client/server messaging and collaboration software.Management: The act or process of organizing, handling, directing or controlling something.
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  1. Yuki Sun-MSFT 40,881 Reputation points
    2023-04-14T02:15:56.21+00:00

    Hi @Brandon Epler ,

    However, I don't have clarity on if having CAS and MBX not on the same server poses a problem from the MS comment "Do not uninstall the last server" (https://learn.microsoft.com/en-us/exchange/manage-hybrid-exchange-recipients-with-management-tools). Does it matter which server is the "last" server part of Exchange

    Per my understanding, the method in the document is not applicable to your scenario, as one of its requirements is "You're running only one on-premises Exchange server and only for recipient management.": 1

    Given this and also considering that Exchange 2013 has reached the end of support, personally I'd suggest migrating to Exchange 2019 first and then use the new method in the aforementioned document to shut down the last Exchange server.


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