If you’re a Microsoft Outlook user, you can delete a mailbox by using the Delete button in the left-hand pane of the mailbox’s screen. If you’re using an Apple Mail or Mozilla Thunderbird user, you’ll need to use the Remove button in the same pane. To delete a mailbox from Outlook:

  1. Open Outlook and click on the menu bar at the top of the screen.
  2. Choose “Outlook” from the menu and then “Mailboxes.”
  3. On the left-hand side of this window, select “Deleting a mailbox.”
  4. Enter your desired name for the mailbox and click on “Delete.”