how to remove mailbox from ad account
In the list of user mailboxes, click the mailbox that you want to delete, and then click Delete. A warning appears asking if youâre sure you want to delete the mailbox. Click Yes to delete the mailbox. The mailbox is removed from the mailbox list.
The following procedure shows how to delete a user mailbox. Use the same procedure to delete other mailbox types after navigating to the appropriate page in the EAC. In the EAC, navigate to Recipients Mailboxes. In the list of user mailboxes, click the mailbox that you want to delete, and then click Delete.