hosting multiple domains on single exchange server

Here is the entire situation:
Comapany 'A' (DKSJ) on SBS server using dksj.net as local domain.  Mail hosted locally on exchange server.  MX records directed to mail.global.frontbridge.com (spam filtering)
Company 'A' (DKSJ) changing name to Company B (DSJ)
new mail accounts needed for Company 'B' for existing users of Company 'A'
company 'A' account will no longer be needed (Phased out). Only need to make sure mail sent to old domain accounts is recieved by existing users on new accounts.
We've already purchased new domain name and enabled new domain on M.S. Forefront (formerly Frontbridge).
local domain will remain Company 'A' dksj.net only because changing domain name on local server is too complicated. (do not want to reinstall operating system).
What is the proper way to accomplish this?
skipbowtAsked:
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LANm0nk3yCommented:
easy

modify default recipient policy add a new email address to the new domain name that they want, set this as the primary.  User's new email address will be updated, and will still get the old email if it comes to the old address.  When emails are sent, the return address is the new email address.
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skipbowtAuthor Commented:
I've already added the new smtp email address domain to the E-mail Address (Policy) on the exchange System Manager.
Outlook says it only allows one exchange account.
The way around this is to create another profile.
Will mail directed to either domain be avilable on both profiles, or will the user have to close outlook and open the other profile to see mail directed to the other domain?
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jeffchunnCommented:
LANm0nk3y is right. Not sure what version of Exchange you're running, but here is a detailed article on how to accomplish what he's talking about with Exchange 2000/2003:  http://technet.microsoft.com/en-us/library/cc164319(EXCHG.65).aspx
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skipbowtAuthor Commented:
Ok,
So creating another outlook profile is not necessary right?  As the old domain mail will be directed to the existing users inbox.
Do I need to set up the new address under each users profile in AD?
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LANm0nk3yCommented:
Nope
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