Users can have two possible e-mail configurations: the mailbox user and the mail-enabled user. Each of these configurations is detailed in the sections that follow.
Mailboxes—the mainstay of any messaging system—are private, server-based storage areas in which user e-mail is kept. Every user in your organization must have access to a mailbox to send and receive messages because it is one of the primary methods of communication. In Exchange Server 2007, a user with a mailbox is referred to as a mailbox user. Mailbox users can send and receive messages as well as store messages on an Exchange server. One of your principal tasks as an administrator is to create and configure mailboxes for users.
In previous versions of Exchange Server, ...