I like to suggest you to use of third party OLM to PST Converter tool to successfully migrate OLM file to PST file format. The OLM Converter files to various file types such as EMLX, MSG, PST, MBOX, EML, HTML, and PDF. This software Keeps the folder structure intact of the OLM file even after conversion.
The Mac OLM to PST Converter Software is an easy and safe application that efficiently convert OLM file into PST format. This has a GUI that makes it simple to use for everybody. Now users can easily migrate OLM files into PST format. This can also export several OLM files to MS Outlook in a single conversion cycle. This software saves the exported data efficiently from inaccessible OLM files. This software quickly retrieves emails, contacts, attachments. A free demo version available for all users.