How to import email from another domain into Exchange 2007

There are two company's (A and B) that share a domain "" with an Exchange 2003 server on it. Now company B is getting thier own separate domain ( with Exchange 2007. What is the best way to get users emails from into the's Exchange 2007? The two domains fully trust each other to help with permissions, but this is not to be a perminant Trust.
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You can use Exmerge to do this . Here are some references:

 How to Use Exmerge to Extract Data from
a Database

Some Questions and Answers About the
Exmerge Utility
stuknhawaiiAuthor Commented:
with exmerge can I tell it what address to assign the .pst to? ALso, will it change permissions?

Yes, ans part of the wizard that you use to export the mail, you can select the mailboxes you wish to import the mail to as long as they are already created on the new server.  See this article for details (just do a <ctrl F> and search for exmerge. This will take you to the pertinent information.

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stuknhawaiiAuthor Commented:
I ended up using the "Move-Mailbox" command from the Exchange CLI. Thanks.
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