We currently have 2 DC's in our domain both running Server 2003. Our Exchange Server is running Server 2003 and Exchange 2003. We are currently at a Server 2000 functional level. In order for us to migrate from LCS 2005 to OCS 2007 we need to raise our domain functional level to 2003. Our concern is what affect this will have on our other services. Our phone system authenticates with AD along with some of our other apps. What changes does raising the functional level make that could even have the slightest affect on other systems or our ability to use them? And what changes are made when raising the functional level?
After the domain functional level is raised, domain controllers that are running earlier operating systems cannot be introduced into the domain. For example, if you raise the domain functional level to Windows Server 2003, domain controllers that are running Windows 2000 Server cannot be added to that domain.
Supported features: domain controller rename, logon timestamp attribute updated and replicated. User password support on the InetOrgPerson objectClass. Constrained delegation, you can redirect the Users and Computers containers
I dont think your other applications will have an effect if they all are running on windows 2000 or 2003 servers.
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