I need help or pointed in the right direction for my research to understanding Active Directory and Exchange Server 2003. From what I have read so far about Exchange I'm not understanding it's relationship to Active Directory's and DNS. It would help if I could see a visual layout of their relationships. Currently I have Active Directory Server that serves also as the Active and DNS server and then I have a File Server and planning to implement an Exchange Server. Am I correct in my thinking that the Active Directory will be the Authenticator for all servers under the network including File Server and Exchange. Where should I begin to focus my understanding of the server relationship and their functions.