Adding a different Email Address through Policies

I have a Exchange 2010 set up.  Our company was bought out.  They want to change the email addresses to reflect.  We already have My.Name@mycompanyone.com but want it changed to My.Name@mycompany.com.    I see in Organization Configuration, Hub Transport, E-Mail Address Policies that there is an ability to ADD an address.  I highlight the current policy and click edit, next, next.  Will that add the new address to the existing addresses or will it only effect new mailboxes?  If it will tattoo all the addresses can I make the new address the primary address here?  

Thanks.
tangot2Asked:
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MaheshConnect With a Mentor ArchitectCommented:
Just wanted to understand that are you looking for same SMTP name space (Shared name space) at source and destination organizations ?
if that's the case check below comment or if this not the case, just ignore my comment

I assumed that both organization are running with MS Exchange as its not reflected in your question.

You have primary SMTP name space with @mycompanyone.com which must be registered on internet

In case of @mycompany.com, this SMTP name space is registered with another company
If you want to receive emails on this name space, then at both ends need some configuration which involves accepted relay domains etc. You need to configure accepted domain at your end and your mail flow should be occurred through there email servers probably

please check below articles for more information related to Shared SMTP name space.
http://technet.microsoft.com/en-us/library/bb124423(v=exchg.141).aspx
http://ibrahimnore.wordpress.com/2012/09/02/cross-forest-smtp-namespace-sharing-part-1/

Mahesh
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comfortjeaniusConnect With a Mentor Commented:
Here is some detail instruction that you can follow to make the changes Exchange Server 2007/2010: How to Change the Primary Email Domain

If you have problems after this just post back...
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tangot2Author Commented:
Anything have to be done with Outlook clients?
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tangot2Author Commented:
Acquisition:  The discovery that you're no longer a big fish in a small pond, or even a small fish in a big pond, but a small fish in a big fish.

The policy change went smoothly.  Thanks for your help.
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comfortjeaniusCommented:
No problem
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MaheshArchitectCommented:
Ya, got it, Thanks

Mahesh
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