I would like to suggest you can use Vartika OLM to PST Converter software to convert all OLM file to PST format, The Software is a perfect solution for move Mac OLM to Windows PST Format. The software supports all versions of MS Outlook to Windows. you can also try the free demo versions of this Software.
Know more info- https://www.perfectdatarecovery.com/en/store/12/vartika-olm-to-pst-converter.html
If you would like to move Mac OLM emails to Outlook PST files, you can use the OLM to PST Converter Tool, which is one of the greatest reliable programs available. It has larger features that make it easy for users to switch their OLM emails to PST. This utility can bulk convert numerous OLM files to PST without moving the order, styles, email headers, or email formatting of OLM emails.
Find more information: https://www.gaintools.com/olm/pst/