repadmin /replsum - Experienced the following operational errors trying to retrieve replication information

Hi, I'm trying to promote a Windows Server 2003 on a domain with all Windows Server 2000 Domain Controllers (The Windows Server 2003 machine is intended to run Exchange 2003).  I'm following the Microsoft Article Q325379.  I used repadmin to determine the OS ServicePack and Version of the domain controllers, and all three Server 2000 DCs were identical (Service Pack 4, Version = 5.0 - 2195).  When I run repadmin /replsum to check replicatation, I get the following:

Experienced the following operational errors trying to retrieve replication information:
8453 - (Lists all three domain controllers with the 8453)

I appreciate any help I can get.

Thank you,
Ryan
TheNewLoboAsked:
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oBdAConnect With a Mentor Commented:
Well, you can technically install Exchange on a DC, especially if you're tight on servers and don't have too many users, but in general, it's not recommended.
Anyway, yes, that should work. And just in case: don't install Exchange 2000 on a Server 2003. The other way works (Exchange 2003 on Windows 2000 Server), but Exchange 2000 hasn't been tested with Server 2003.
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oBdACommented:
The additional DCs might not have ended up in the correct container in AD; check here:
"Replication Access Was Denied" Error Messages Occur After You Promote a Server to Domain Controller
http://support.microsoft.com/?kbid=329860

You're aware that running Exchange on a DC is not recommended? And note that running dcpromo on an Exchange server is not possible without breaking Exchange (which means you can install Exchange on a DC, but you can't run dcpromo on an Exchange server, and you can't demote a DC running Exchange without uninstalling Exchange first)!
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TheNewLoboAuthor Commented:
Thank you oBdA, I thought Exchange had to be installed on a DC.  Now I know not to do that.

We currently have: 1 Exchange Server 2000 machine on Server 2000, and 2 Server 2000 machines.

The new machine has Server 2003 which I just installed, and it's a member of the domain.  I was going to promote it to a DC, then install Exchange 2003.  Now that I know not to promote it to a DC, can I just go ahead and install Exchange 2003 on this new machine and let the Exchange setup perform the forestprep and domainprep to extend the schema?
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