I have some test servers including 4 DC's (Windows 2003 SP2) - Domain & Forest Functional Level - Server 2003. I have one Windows 2003 SP2 Server with Exchange Server 2003 and I added the first Windows 2008 R2 SP1 Standard with Exchange 2010 SP1. Everything went fine in the installation, but after I noticed that each server can see the other server but they can not see the database on the other server. Can anyone please give me some idea of what I should be looking for? Thank you!