PDS OLM Converter Software provides an easy method to export OLM files into PST format. The software keeps all original email properties intact, including:

Email formatting
Attachments
Sender and receiver details
Date and time information
Folder hierarchy

The application is designed with a simple interface, making it suitable for both technical and non-technical users.

https://www.perfectdatasolutions.com/en/olm/olm-to-pst-converter.html