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Exchange 2010 - 2016 migration - URLs

jarweb 131 Reputation points
2021-05-27T09:55:14.503+00:00

Hi
I am in the process of upgrading/migrating from Exchange 2010 to 2016
I have already installed the 2016 server and am working through the Deployment Assistant.

My question is regarding the changes to the internal/external web URLs. All the mailboxes and internet access is currently via the Ex2010 server and I do not want to interrupt service to end users until or if it is definitely required.

If I make the required changes to the URLs such as adding "mail.domain.com" to the Ex2016 server, will this affect user access to the 2010 server as this will also have "mail.domain.com" listed in its own settings ? Is this going to cause issues with client access if both servers have the same URL ?

There is no real mention of how or if this might affect the Ex2010 server in the deployment assistant, or if changes also need to be made to the 2010 server.
I'd rather not change too many things if I don't need to in case I need to roll back.

Thanks

Exchange | Exchange Server | Management
Exchange | Hybrid management
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  1. Andy David - MVP 157.8K Reputation points MVP Volunteer Moderator
    2021-05-27T11:16:49.437+00:00

    2016 will proxy to 2010, so you need to make that change:
    https://techcommunity.microsoft.com/t5/exchange-team-blog/client-connectivity-in-an-exchange-2016-coexistence-environment/ba-p/603945

    Read this and make sure you set the Outlook ANywhere settings correctly.

    Also ensure your CAS Array FQDN is not used except for the 2010 CAS Array:

    https://techcommunity.microsoft.com/t5/exchange-team-blog/ambiguous-urls-and-their-effect-on-exchange-2010-to-exchange/ba-p/593809

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  1. jarweb 131 Reputation points
    2021-05-27T15:08:49.767+00:00

    Hi
    Thanks for the response

    Regarding the second link. We don't have a CAS array in the environment. It's a simple setup with a single 2010 server migrating to a single 2016 server.
    Does this information still apply ?

    Thanks

  2. jarweb 131 Reputation points
    2021-05-28T07:47:02.077+00:00

    Hi
    Just to clarify.

    I understand I need to make the URL changes on the 2016 server.

    But do I need to actually remove the external entries (mail.domain.com) from the 2010 server or can I just leave these ? Again I'd like to make the minimum changes necessary in case I need to roll back.

    @Lucas Liu-MSFT 's reply said "You can set Exchange 2010 and Exchange 2016 to be the same"

    So they can both contain the external URLs and it shouldn't cause any conflicts ?

    Thanks

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