The best software to convert OLM files to PST is to use Aryson OLM to PST Converter. You can use this tool to convert your Mac OLM files into multiple file formats. This tool is beneficial for both technical as well as non technical person due to its simple and easy user interface. The tool gives you the feature to see the selected OLM files before starting the conversion. Other than emails, you can export contacts, photos, journals, notes and calendars. Moreover, the tool provides free demo version through which you can download 50 emails per folder for free.
Another method that I would like to suggest is the CubexSoft OLM to PST Converter, which makes it simple to import OLM file to PST format without the need for Microsoft Outlook. All OLM emails, contacts, tasks, calendars, notes, attachments, and other data can be easily transferred into PST format. Its free demo pack is also available for download on all Windows and Mac OS versions without any issues.