Exchange 2003 ADC and Exchange 5.5 Replication only working one way


I am trying to get Exchange 5.5 and Exchange 2003 to co-exists so that I can gradually move my users over little by little.
I have installed exchange 2003 on a member server and my exchange 5.5 server is also on a member server.
Both exchange servers are on the same Windows 2000 domain.

I installed the ADC on my exchange 2003 server and have managed to get replication working one way only.
I am now able to send mail from Exchange 2003 to Exchange 5.5, but cannot reply to the user.
I suspect its because replication from Windows to Exchange has not taken place.
I have tried using an account that has "Service Account Admin" as well as "Permissions Admin"on exchange 5.5.
The Recipients container if have selected as destination is still empty.

Please help

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I've been down the same road.  Unfortunately I don't have an answer for this - I decided to make life easier and just migrate everyone in one shot.  What made my transition easier was that I followed these basic steps:

1) Made sure that new exchange server was configured properly.  All user accounts and groups created / permissions set.
2) Tested, Tested, & Tested.  Had peers test / had them follow a test script + challenged them to "try to break it".
3) Disabled inbound SMTP Email, Disabled Internal Email (Both done off-hours).  ( Can simply unplug Ethernet Cable.)
4) Backed up Exchange 5.5 mailboxes then shut down Exchange 5.5 Server.  
5) Restored Exchange 5.5 mailboxes onto Exchange 2003 Server.  (CommVault does this - can bu from one, restore to another.)
6) Repointed NAT on firewall to forward inbound SMTP to new Exchange Server.
7) Created a new DNS CNAME Record that used the Exchange 5.5's Servers Name and pointed it to new Exchange 2003 Server name.  (This way you do not have to repoint all of your clients.)
8) Tested Internal Email.  Tested, Tested, & Tested.
8) Enabled SMTP on Exchange 2003 server.
9) Watched Internet Email come in.  Tested, Tested, & Tested.
10) Backed up new server.
11) Went home after migrating 300+ Mailboxes with 30 GB of Data in about 4 hours.

I knew that by following this path that if I did discover any issues, I would be able to recover by simply turning up the old server after switching back the SMTP pointer and deleting the CNAME DNS Record.  Although this is not the MS preferred method, nor is it the most scientific method of migrating - its was a quick and painless method...  I was home before noon on a Sunday.

Good Luck.


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