Outlook Mac users those are not technically sound come back to Windows Outlook for which they have to perform OLM to PST Conversion that can only acquired via some external application. To find better solution for converting OLM files to PST format, you will have to use some Mac database to Windows Outlook free applications. Mac Database to Windows Outlook free utility always help to get an idea about full pro version of tool and same facility is availed with Outlook Mac Exporter in FREE version.
Check Here: http://www.olmtopst.olm1.org/