You need to Best Methods to Convert Outlook OLM to PST. I suggest the ToolsBaer OLM to PST Conversion Tool is an Easy Solution. This tool will save all of your emails, messages, attachments, journals, contacts, calendars, tasks, notes, and other information to an Outlook PST file using OLM file features. It supports all Windows and Mac OS versions.
Here are the steps to convert Mac Outlook to Outlook PST file:-
Download and install the "OLM to PST Conversion Tool" on your computer.
"Select OLM files" for migration by using the “Add Files” option and Clicking on the "Browse" Button.
Show the "Preview" of Mac Outlook .olm files.
"Select the destination location" to save the PST file. Click on the "Browse" Button
Click on the “Convert Now” button to start the conversion process.