If you are searching for software to convert OLM to PST, then you can use MacSonik OLM Converter for Mac. This application is one of the most reliable tools to convert Mac Outlook OLM files into Outlook PST format. It helps to convert OLM files in PST and other file formats like EML, EMLX, MSG, and MBOX. It exports OLM file data items like emails, contacts, attachments, calendars, etc. without any data loss. Moreover, with the help of the same, they can convert first 50 files from OLM to PST free of cost.
Simply install this tool of macsonik named OLM converter and you will be able to convert your files into any of format.