I suggest you to try this ultimate software KDETools OLM to PST converter which provides the efficient solution to save the file in different format like HTML, Office 365, EML, EMLX, MSG, PDF etc. This tool provide an advanced features you can split PST files into smaller parts.
Here is the best solution to transfer OLM files to PST format. Try the OLM to PST Converter tool, which can easily migrate OLM files to PST without losing any information. It can easily migrate all attachments including emails, notes, journals, etc. This tool supports all Windows operating system versions. Download the trial version. Refer to: - https://www.osttopstapp.com/olm-to-pst.html