Raise Domain Functional level

Went to raise the domain level and I got the following message:

You cannot raise the domain functional level because the domain includes Active Directory Domain Controllers that are not running the appropriate version of Windows.

The message also said that the current domain functional level was Windows Server 2003. We have no 2003 DC's in our environment, we only have 2008 and 2012.
Dawin DaiseSr. Windows Systems AdministratorAsked:
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Cliff GaliherCommented:
Look in ADUC and Sites/Services for old DC's that were never removed from those places. That's the usual culprit.
Seth SimmonsSr. Systems AdministratorCommented:
check AD
you may have a 2003 server that was not removed properly
if so, you need to do a metadata cleanup

Clean Up Server Metadata

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Windows Server 2012

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