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?