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?
garmstrong2008Asked:
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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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SommerblinkCommented:
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.
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Life1430Commented:
run repadmin /replsum and dcdiag /q /e from  DC and post the output so we may have suggest further
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SandeshdubeySenior Server EngineerCommented:
The symtoms indicates that there is replication issue between DCs whcih is causing the issue.http://terenceluk.blogspot.in/2011/04/upgrading-active-directory-forest-level.html

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