Export all other Mac Mail folders that way.Specify the location (destination folder) to save the exported mailbox and confirm saving.Run Mac Mail application, select folder you want to export and go to menu Mailboxes, then click Export Mailbox….This small instruction describes the way to convert Mac Mail messages and folders to Outlook for Mac OS: So, how to export mailboxes in Mac Mail for Outlook? Although the issue is now resolved, this is not a 1-click procedure. Cross-platform migration is a challenging undertaking. Outlook is a fixture of business communication thanks to its extensive features. Luckily, the Microsoft client is now compatible with both operating systems, which makes the task more feasible. Sometimes, they are dissatisfied with limited functionality. Users switch between mail clients for different reasons.