If you want to export MAC OLM to PST, I would like to suggest KDETools Mac OLM Converter. This software easily exports MAC OLM files to PST, and other file formats like EML, EMLX, MSG, MBOX, etc. This software provides a free demo version tool with the help of this tool user can migrate only 30 files as a trial.
There many third party tools are available on the web for converting Mac OLM files into an Outlook PST file, but if you want to convert OLM file into PST and also in formats like HTML, PDF and RTF with accuracy I recommend OLM to PST converter tool. User also can export OLM mailbox data directly into Office 365 mailboxes. The tool supports Mac 2019, 2016 & 2011 OLM Files, MS Outlook 2019, 2016, 2013, 2010, & older and all versions of Windows OS. For more information, visit: https://www.datarepairtools.com/olm-to-pst-converter.html
For the best and error-free result, you should adopt OLM to PST Converter. This is the best GUI based software that allows users to convert every single email from OLM to PST. You can download and install the tool on Windows-based operating system and product a new PST file for Outlook 2019, 2016, 2013, 2010 & other earlier versions. With the free demo version, you can migrate the first few emails from each mailbox and after upgrading the utility, you can export the unlimited mailbox from OLM to PST. Reference:- https://www.mailvare.com/free-olm-to-pst-converter/