troubleshooting Question

Exchange OWA website Redirection

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TeavanaFlag for United States of America asked on
Web DevelopmentExchange* OWADNSMicrosoft IIS Web Server
7 Comments1 Solution410 ViewsLast Modified:
Hi Experts,

We have two domains A and B that have a two AD trust between then. DNS and all AD functions are working fine between the two domains.

We are in the process of upgrading our exchange environment from exchange 2010 to exchange 2013 in a DAG configuration (two CAS servers and two Database servers).

The new exchange 2013 DAG servers are in the domain A.  We have successfully migrated the 2010 exchange users and mailboxes in domain A from their exchange 2010 environment.
We want to host the emails for domain B on the new exchange 2013 DAG servers in domain A.
The users in domain B will continue to use their AD credentials in domain B, nothing in AD will be changed in domain B or domain A.

Based on my understanding and some research, we need to configure a Link mail boxes between the two forests and perform a cross-forest migration between the two domains.

The end users for each domains are using their own registered domain to access their emails using OWA. For example, and

The consultant that is doing the cross-forest migration portion of this project is saying that once we migrate the domain B exchange mailboxes to the target domain forest (domain A) the end users in domain B will have to use the URL for domain A in order to access their e-mails in OWA and on their smart phones.

We migrated some test users from domain B to domain A. I created a custom connector to allow emails that are sent to the migrated users from domain B to domain A to work.
However, when the migrated users from domain B tries to use the OWA URL for domain B, it does not work. I am getting the attached error message.

If I use the OWA URL for domain A for the migrated users from domain B it works.

My issue, is domain B need to keep their registered public domain to access their OWA   URL not domain A OWA URL.
IS the above possible, or I need to now tell the users in domain B that will have to use Domain A OWA URL ( to access their emails instead of their own registered domain (

Let me know if you need more information, I tried to explain as much as I could.
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