Apple Mail and Outlook are two completely different email clients, which stores mailbox data in two different file format. Apple Mail stores data into MBOX format while Outlook generally stores mailbox data to PST format.
If you are looking for the solution to convert Apple Mail MBOX to Outlook PST format then you can utilize most reliable EmailsGuru MBOX to PST Converter tool. It is dedicated tool to recover and transfer complete mailbox data from MBOX to Outlook PST format maintaining whole data integrity and original folder hierarchy. It easily import emails from MBOX to PST format and offers to access or import them to Outlook 2019, 2016, 2013 and all earlier versions. It is completely professional way to migrate Apple Mail data to Outlook.
Read more- https://www.emailsguru.com/mbox/pst/