Although the title is “Deleting a User’s Mailbox,” these solutions don’t really delete the mailbox. They actually just clear the Exchange attributes from the user object and that disassociates the mailbox from the user. The mailbox will still exist in the Exchange store. The length of time it will exist depends on the mailbox retention period, which is, by default, 30 days. While the mailbox exists in that state, it can be reconnected to the same or a different user object.

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A mailbox-enabled user is a user who has a mailbox defined in the Exchange organization where the user object exists. This is the most common object in an Exchange organization.

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Using a graphical user interface

1. Open the ADUC snap-in.
2. This needs to be run on a workstation or server that has the Exchange Management Tools loaded
3. If you need to change domains, right-click on Active Directory Users and Computers in the left pane, select Connect to Domain, enter the domain name, and click OK.
4. In the left pane, browse to the parent container of the user, right-click on the user, and select Exchange Tasks.
5. On the Welcome screen, click Next.
6. Select Remove Exchange Attributes and click Next.
7. Read the warning and click Next.
8. On the Completion screen, click Finish.

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A mail-enabled user is a user who has at least one email address defined within Exchange, but does not have a mailbox. This does not give any access rights to the user within the Exchange system; it simply allows Exchange users to select the mail-enabled users from the global address list (GAL) and easily send email to them. You would use a mail-enabled user when you have a user who needs to log into the domain, but has an email address external to the forest’s Exchange organization. The email address could be external to the company or it could just be external to the Exchange organization of that forest. Examples would be users with mailboxes on external email systems or users with mailboxes on internal non-Exchange servers.

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There are several services involved with Exchange Server. Stopping different services will accomplish different things. The services are interdependent, so when you stop or start various services you may see a message about having to stop dependent services. If you do stop dependent services, don’t forget to restart them again when you restart the service you began with.

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