If you are looking for the method to export Apple Mail to MS Outlook, just follow the following steps:
First, you should convert Apple Mail data to MBOX.
1: Open the Apple Mail on the Mac.
2: Click on the File-> Import Mailboxes option.
3: Below the ‘Import data from:’ choose the program to import data that is ‘Files in MBOX format’.
4: After that, click on Continue.
5: Find the location of the MBOX file by clicking on Choose, and click on Continue button.
6: Finally, click on the Done tab after the complete process.
These are the manual steps you can try them for free.