We have a domain with various servers from Windows Server 2000, 2003 & 2008 R2.
We have two domain controllers
Primary DC 2008 R2. Secondary DC 2003 R2.
The 2000 Servers are simply holding legacy applications and are not Domain Controllers.
Our functional level of the domain and forest is set to 2000 Native.
Are there any issues with raising the funcitonal level of the domain and forest to 2003?