How to change the mail domain in exch 2007, but not changing the AD Domain

My customer wants to change the name of their email domain and then make the old email domain name a secondary email address for a while.
They are not changing the domain name in AD, just email domain.
So I need to know what all I need to do to make this work.?
Ex: old email name is and they want it to now be
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Jeff PerryWindows AdministratorCommented:
vmichAuthor Commented:
I need it for exchange 2007. Is that the same as for 2010 which you listed here?
vmichAuthor Commented:
Also will owa change or does it have to change?
Can is stay as the old email domain name?
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Jeff PerryWindows AdministratorCommented:
For Exchange 2007 you will have to follow several links from this page to accomplish the same goal.

I would leave OWA as it is unless you absolutely have to change the address it is accessed from.
vmichAuthor Commented:
I found a good document for getting this done. Thanks to all for your input.

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This document discusses how to modify the accepted domains and recipient policy, have you thought about creating an Mail eXchanger record in Public DNS for mail delivery? if you intend to change your OWA namespace i.e. to then there are additional steps needed. You will need to obtain a new Public certificate (SAN) with the new subject names (, and maybe if your co existing with a legacy version of Exchange), you will also need to update the external url of your virtual directories, you can do this with

Get-OwaVirtualDirectory | Set-OwaVirtualDirectory -ExternalUrl "Https://"
Get-ActiveSyncVirtualDirectory | Set-ActiveSyncVirtualDirectory -ExternalUr "Https://"
Get-EcpVirtualDirectory | Set-EcpVirtualDirectory -ExternalUrl "Https://"
Get-OabVirtualDirectory | Set-OabVirtualDirectory -ExternalUrl "Https://"
Hope this helps
vmichAuthor Commented:
We are not going to change OWA..
vmichAuthor Commented:
this article is a good article and it solved my issue...
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