A professional converter like PDS OLM Converter for Mac
makes OLM to PST migration simple and secure. The software supports selective conversion, allowing users to export only chosen folders, emails, or attachments instead of the complete mailbox.
It also supports bulk conversion, which helps users process multiple OLM files simultaneously while maintaining original metadata such as sender information, timestamps, and read/unread status.
The software is compatible with both small and large-sized mailbox files and ensures smooth migration to Microsoft Outlook for Windows.
https://www.perfectdatasolutions.com/en/olm/olm-to-pst-converter.html
There are multiple best ways to convert OLM emails to PST format then there are multiple online websites where you can easily convert this file online.