In Microsoft's Proffered architecture, it says to move dns to point to exchange 2013 once it is ready in exchange 2010 coexistence environment. I have a question here.

- If we don't change URL to point to 2013 CAS and setup different URL for it and just migrate mailboxes from 2010 to 2013 which will pick up to new URLs with OA?

-Also i was checking deployment assistant it says to use or can be used same URL for all services, however i have heared some where else that OA internal and external URL should be different because of authentication issue. 

Any advise?

Thanks

Autodiscover will return appropriate URLs for their mailbox based on how the server's virtual directories are configured.  You don't have to point the URL hostnames to Exchange 2013 if you don't mind telling people to use a different URL for services and manually reconfigure mobile devices when their mailbox moves.  I don't know why you don't want to do it the standard way, I think you're making a lot more trouble for yourself.

You many want to configure a different external URL for Outlook Anywhere, but you can always do that later.  For planning purposes you could add that hostname into your certificate request in the beginning.

Thanks, the reason of the question was to know the impact. And secondly how can deployment assistant says something which contradict with actual implementation recommendations where it says don't use same URL for OA internally/externally

There are cases where you would want a different URL externally, but it all depends on your implementation whether that is necessary.

Hi,

Based on my knowledge,we can use these below settings:

ExternalHostname: mail.domain.com

InternalHostname: mail.domain.com

ExternalClientAuthenticationMethods: Basic

InternalClientAuthenticationMethods: NLTM

IISAuthenticationMethods: Basic, NTLM, Negotiate

I think we can use the same OA internal and external URL.

For more detailed information,please  refer to the following link:

https://technet.microsoft.com/en-us/library/bb123545%28v=exchg.150%29.aspx?f=255&MSPPError=-2147217396

Regards,

David

Hi,

Based on my knowledge,we can use these below settings:

ExternalHostname: mail.domain.com

InternalHostname: mail.domain.com

ExternalClientAuthenticationMethods: Basic

InternalClientAuthenticationMethods: NLTM

IISAuthenticationMethods: Basic, NTLM, Negotiate

I think we can use the same OA internal and external URL.

For more detailed information,please  refer to the following link:

https://technet.microsoft.com/en-us/library/bb123545%28v=exchg.150%29.aspx?f=255&MSPPError=-2147217396

Regards,

David

• Proposed as answer by David Wang_Microsoft contingent staff 6 hours 19 minutes ago

http://blogs.technet.com/b/exchange/archive/2014/02/28/namespace-planning-in-exchange-2013.aspx

have a look at following in this article

Important: In the event that you are utilizing a split-brain DNS infrastructure, then you must utilize the same authentication value for both your internal and external Outlook Anywhere settings, or switch to use different names for Outlook Anywhere inside and out. Outlook gives priority to the internal settings over the external settings and since the same namespace is used for both, regardless of whether the client is internal or external, it will utilize only the internal authentication settings.

That is correct, but it applies to Outlook Anywhere only.