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jarweb-3427 avatar image
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jarweb-3427 asked LucasLiu-MSFT commented

Exchange 2010 - 2016 migration - URLs

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

office-exchange-server-administrationoffice-exchange-server-connectivityoffice-exchange-hybrid-itpro
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AndyDavid avatar image
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AndyDavid answered LucasLiu-MSFT commented

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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Hi @jarweb-3427 ,
Agree with what andy said. You can set Exchange 2010 and Exchange 2016 to be the same. Exchange 2016 will proxy the request to Exhange 2010.
And the first link provided by Andy details the client connection in the coexistence environment of Exchange 2010 and Exchange 2016. You can refer to it.



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jarweb-3427 avatar image
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jarweb-3427 answered AndyDavid commented

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

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Yes, the first link still applies. Move the client end point to the 2016 server and the connections will be proxied to the 2010.
You can ignore that second link if no CAS Array is defined.

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jarweb-3427 avatar image
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jarweb-3427 answered LucasLiu-MSFT commented

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.

@LucasLiu-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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Hi @jarweb-3427 ,
According to my configrate in Exchange 2010 and Exchange 2016 coexistence environment. I set all internal and external URLs in Exchange 2010 and Exchange 2016 to mail.domain.com, no unexpected errors occurred in the use of Exchange 2010 mailbox. So I think you can keep the external url in Exchange 2010. In addtion, please update the DNS and autodiscover point to Exchange 2016.



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