How to Export Outlook to Apple Mail?

If you are taking about a secure method then I will recommend to use Apple Mail to Outlook Converter.

As the manual trick doesn't convert damaged MBOX File but this converter is capable to convert corrupt or damaged Apple mail MBOX to Outlook PST.

You can export multiple Apple Mail files to Outlook.

No need for any technical help to use this wizard.

Yet to get upgrade to run on Mac but it supports all versions of Widows OS.

If the account is an IMAP account just set up the account in Mail and the emails will be synchronized.