exchange 2003 and 5.5 not synchronizing

Here's the scenario:
I'm not an expert in Exchange. We had a consultant come in to migrate most of the users to a new 2003 box with exchange 2003. There was an OU (named Migration) that was setup to replicate with 5.5 directory. One of my colleaque was cleaning up the AD and renamed this Migration OU to something else, and also created a bunch of other OUs.

Here's the problem:
When creating a user on AD on the 2003 box, it is no longer replicating to the NT's 5.5 exchange. GAL is on the 2003 box, so user shows up on GAL, internal emails inbound and outbound is ok. But since the SMTP is on 5.5, external inbound email are bounced back with: The recipient name is not recognized error.

I went to the AD Connector Services and edited the Connection Agreement:
- From Windows tab: added all of the newly created OUs
- From Exchange tab: changed the default destination from Migration OU (initial & deleted OU) to Transition1 OU.

Tested by creating a new user on Transition1 OU, but still no luck in replicating it to 5.5.

Please help shed some light. Thanks!
Who is Participating?
aa230002Connect With a Mentor Commented:
What if you create a new mailbox in Exchange 5.5? does that replicate to Active directory via Recipient Connection Agreement? Do you see any errors in the Application log on the server where you have your Active Directory Connector installed?
In which OU, you created this new user in AD? is this OU added to the "From Windows tab" on the Recipient connection Agreement. You might want to go to Connection tab on Recipient connection Agreement and re-enter the user name and password and say "Replicate Now" by right clicking on the Recipient Connection Agreement
and then check the application log if there is any error.

Amit Aggarwal.
dellonAuthor Commented:
Great tips on places to look. The application log shows that even after I point the destination to "Transition1", it was still looking for "Migration". I renamed Transition1 to Migration, reran the replication and works fine.
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