1. Open the Mail application.
(#img image001.png#)
2. Right-click on Ctrl+click on the folder you wish to export, then select Export Mailbox…
(#img image002.png#)
3. Select a location where you would like to save the exported mailbox. Then select the Choose option. A .mbox file will be stored in the selected location.
(#img image003.png#)
You now have a copy of the selected Apple Mail mailbox.