Exchange SBS 2003 to 2010 Migration

I'm working on migrating a SBS2003 box to Server 2008 R2 and Exchange 2010.

The issue I am having is when I change the firewall to point to the SMTP on the Exchange 2010 box, no users on the Exchange 2003 box are getting email and vice versa.

I thought there was a way to make the two servers talk to each other for incoming SMTP, but it has been a while since I did a migration.

Any ideas?
truth_talkerAsked:
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Slav ZabickiConnect With a Mentor System EngineerCommented:
by the way read this article: http://www.networkworld.com/community/node/47632

check if you didn't miss any steps
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Slav ZabickiSystem EngineerCommented:
did u move mailboxes from 2003 to 2010?
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truth_talkerAuthor Commented:
I haven't moved all of the mailboxes yet.  I have multiple sites and don't want to move everyone at one time.

Was hoping I could have the email come into one server and send over to the other server if not in the main server receiving on SMTP.
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Slav ZabickiSystem EngineerCommented:
hmm
are those mailboxes you moved to 2010 working fine?
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truth_talkerAuthor Commented:
Think I just figured it out.  Needed to create a Routing Group between the two servers.

Used this link and now mail is flowing out and in through both servers but from the Internet only to one server's SMTP on port 25.

http://social.technet.microsoft.com/Forums/en-US/exchange2010/thread/f379cce6-b440-470e-b262-5a9f0eae53a4
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