A mail-enabled contact is a contact that has at least one email address defined within Exchange. A contact cannot have a mailbox because it is not a security principal, so there is no way to safely authenticate the object. You use a mail-enabled contact when you have an email address external to the forest's Exchange organization that you want to be listed in your GAL. The email address could be external to the company or it could just be external to that forest's Exchange organization. Examples would be people from other companies or users who do not use the Active Directory of the Exchange organization.

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Mailbox sizes and message counts are items on Exchange systems that administrators routinely want to know about for the purposes of reporting and metrics. Administrators want to know if their mail system is balanced and if users are spread across the mailbox stores evenly. Knowing the number of users and the size of their mailboxes in each mailbox store, the administrator can make better decisions about where new user mailboxes should be placed or if some leveling of mailboxes is required.

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Mailbox moves are commonly done in many Exchange organizations due to servers getting upgraded, server hardware issues, users migrating from Exchange 5.5 to Exchange 2003, or the administrators wanting to readjust mailbox location for load balancing.

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When you tell the system to delete an Exchange mailbox, it isn't really deleted. It is simply disassociated or disconnected from the user object. These mailboxes are referred to as orphaned or disconnected. This shows you how to enumerate the disconnected mailboxes you have on a specified server.

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When you tell the system to delete an Exchange mailbox, it isn't really deleted. It is simply disassociated or disconnected from the user object. These mailboxes are referred to as orphaned or disconnected. Deleted mailboxes stay in this disconnected state for a configurable period, by default 30 days, and can be recovered any time in that period. To truly remove a mailbox before that time, you must purge the mailbox after the deletion. This shows how to reconnect that disconnected mailbox back to the original user object, or, if you prefer, an alternate user object.

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