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:
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

comfortjeaniusCommented:
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...
MaheshArchitectCommented:
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

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
tangot2Author Commented:
Anything have to be done with Outlook clients?
Get Blueprints for Increased Customer Retention

The IT Service Excellence Tool Kit has best practices to keep your clients happy and business booming. Inside, you’ll find everything you need to increase client satisfaction and retention, become more competitive, and increase your overall success.

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.
comfortjeaniusCommented:
No problem
MaheshArchitectCommented:
Ya, got it, Thanks

Mahesh
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Exchange

From novice to tech pro — start learning today.