Exchange 2010, New Domain, OWA and Active Sync

cchayden
cchayden used Ask the Experts™
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We are switching our main email to a new domain. I was wondering if I could easily coexist the new and old domains in OWA and Active sync. (I have done a little searching and I don't think it is as easy as pointing the new domain DNS entries to the server but I am coming here for a little confirmation.)

For example tell users to start using webmail.NewDom.com/owa but not have webmail.OldDom.com/owa stop working. Also have all of the new IOS devices start using mail.newdom.com for their ActiveSync but not break the hundreds of existing IOS devices that still use mail.OldDom.com.

Thanks!
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Most Valuable Expert 2014
Commented:
As long as you have both the old and the new domain listed in the SSL certificate, then it will continue to work fine.
The host name in the client has no connection to the domain being used for the email address.
Therefore you could quite easily leave everything alone, setup an SRV record for Autodiscover in the new domain and tell everyone to use the old domain for OWA/ActiveSync access. Technically nothing wrong with doing that. Politically on the other hand...

Therefore get the DNS records duplicated, and get your UC certificate reissued with the new and old names on it:

host.example.com
Autodiscover.example.com
host.olddomain.com
Autodiscover.example.com

Do that before you make the change and then the transition will be completely seamless (unless you have Outlook 2003 using RPC over HTTPS).

Simon.

Author

Commented:
Awesome ty.

tell everyone to use the old domain for OWA/ActiveSync access. Technically nothing wrong with doing that. Politically on the other hand...

This kind of implies that it is either olddom or newdom but not both for OWA and ActiveSync. I know someone is going to say to me "How come we are still using OldDom for our webmail. I thought we were rebranding ourselves 100%..." Is that the case?
Most Valuable Expert 2014
Commented:
It would only be either domain if you haven't got the SSL certificate updated. Once you have the certificate updated with both domains then you can use either host name.
If you have changed the URLs within Exchange to the new URL, and someone accesses OWA with the old URL, then Exchange will correct it. However it will work with no SSL prompts.

Simon.

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