If you want to mirgate Apple Mail to MS Outlook and you don’t want to buy any software. You can try this way.
- Open Apple Mail and import all of mbox into Mail.
- Create a Gmail’s Account and connect to Apple Mail.
- Move the mbox to Gmail’s Account in Mail. You will see the mail syncs to Gmail after movement.
- Open MS Outlook and connect to you created Gmail’s Account then you will see the mail from you sync.
- Now you could backup mail to pst or use MS Outlook directly.