Microsoft Exchange Server has several roles it can be assigned within an organization. They include Client Access, Mailbox, Hub Transport, Unified Messaging and Edge Transport. The Client Access server processes mail for e-mail clients (Outlook, Eudora, Thunderbird etc.). Mailbox servers store e-mail. Hub Transport servers route e-mail within an organization and Edge Transport servers send e-mail to and from servers on the Internet. Much of the documentation does not clearly communicate how e-mail is routed among these servers. The following diagram shows the communication flow among Exchange Servers based on their roles in an organization:
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