Is It Possible to Convert Multiple OLM Files into a Single PST?
Over the years, I have several OLM backups stored separately. Managing them has become difficult. Is there any way to merge all these OLM files into one PST file without losing emails or folder structure?

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kane william commented
You can convert several OLM files to a single PST as long as you use SameTools to Convert OLM to PST. The software has advanced functionality that allows users to add and combine multiple OLM files into one PST and not lose any data. It keeps their emails, attachments, contacts & other items intact but keeps the original folder structure. Since the interface is so simple to use, even non-technical users can smoothly complete the conversion. Furthermore, this application also ensures complete data integrity & works efficiently on all Outlook and Windows OS versions, making it a reliable multiple OLM files into a single PST file.
Read more: https://www.sametools.com/convert/olm/