Can't Raise Functional Level or Replicate

We are migrating from Windows SBS 2003 to Windows 2008R2 running Exchange 2010. Our domain has 2 domain controllers. One is a DC and a terminal server running 2003 and the other is a DC and Exchange server running 2003 SBS. I am trying to raise the functional level of active directory from windows 2000 to windows 2003 on the Windows 2003 SBS. This is one of the steps in the migration. However, I get the error Active Directory is busy. Either will these two servers replicate. How can I fix this problem?
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Will SzymkowskiSenior Solution ArchitectCommented:
Have you checked if you replicaion is working properly?

Do the following...

- Login to the DC (FSMO holder)
- run repadmin /replsum (check to ensure that replication is working correctly)
- run DCDIAG /test:DNS (this will run a series of test to ensure that DNS is functioning properly)

Also make sure that you check your diretory services event log for more detailed information/errors that may be occuring.

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The advice above is solid.

I wanted to add that until you resolve ALL your AD problems and have them confirmed resolved, you do NOT want to make any additional changes to your AD environment.
run repadmin /replsum and dcdiag /q /e from  DC and post the output so we may have suggest further
SandeshdubeySenior Server EngineerCommented:
The symtoms indicates that there is replication issue between DCs whcih is causing the issue.

Post the dcdiag and repadmin log as suggested.Check the directory service event log too for more details.
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