If you are looking for a tool that will help you to import PST files to MBOX easily then. I would like to suggest you to use this most reliable Solution Regain PST to MBOX Converter that can Convert your Outlook PST file to Thunderbird MBOX file in just simple and easy process. This Software has Selective Conversion option where you can easily select those files which you want to Convert.
Note: You can also try this Software free demo version where you can save 30 emails per folder at free of cost. In free demo version you can also see the preview of all Convertible emails before saving.
You can download this Software free demo version from here:
I would like to recommend you the PST to MBOX Converter tool which is an effective programming move data from Outlook PST to MBOX on Windows. This tool can changes over different PST files into Outlook MBOX format or like EMLX, EML, MSG and so forth it permits to cluster transformation of PST files into MBOX format with connections. It Compatible with MS Outlook variants 2019, 2016, 2013, 2010, 2007 for Window. Visit:- http://www.softwaretoconvert.com/pst-to-mbox/
-- Edited by timhotswil on Saturday 6th of June 2020 01:18:46 PM
You can try a perfect professional Mac PST to MBOX Converter application that helps you to understand how to convert Outlook PST data file to Outlook MBOX file format without any data loss. Mac PST to MBOX Converter Tool can easily maintain email folders to restoring CC, BCC, To, From and attachments. This tool supports all MS Outlook and Mac OS versions.