Setting up a 2nd domain in Exchange 2010

One division of our company is spinning off into its own.  While the new company works on how they want their IT infrastructure set up going forward they will continue to use current network resources (Exchange server, fie server, etc...)

They would like to use their new email addresses once the new company goes live (ex john@newcompany.com)  How do I set it up on our current exchange server for a 2nd domain so that while I continue to send/receive email as jack@oldcompany.com the employees from the new company can send/receive email as john@newcompany.com?

Thanks
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jmerullaAsked:
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Nick RhodeConnect With a Mentor IT DirectorCommented:
You would add newcompany.com as an accepted domain.  You can then either add the @newcompany.com address through using the email policy to all accounts or do it manually.  On the accounts you want for newcompany.com you would have to set that email address as their default and uncheck automatically update via email policy.

Steps:

1) Add Accepted Domain

Organization Configuration > Hub Transport > Accepted Domains Tab

2) Add or Edit Email Address Policies

Organization Configuration > Hub Transport > E-mail Address Policies

**This is where you can add the newcompany.com and it will add the address to all mailboxes.  Otherwise you can create a new policy and assign it to specific mailboxes**

3) Adjust Mailboxes

Recipient Configuration > Mailbox > Properties > E-Mail Addresses Tab

Remove check from "Automatically update email addresses on email address policy

Set default address (aka Set as Reply).

**This is the step to manually adjust.  If you set it via policy this does not have to be done**
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