There are many methods available but I suggest a manual process that user can easily move Thunderbird file into PST format with the help of Thunderbird to PST Converter.

It also supports all email client application such as Thunderbird, PowerMail, Entourage, Eudora, and etc. This tool has multiple advanced features that user can export Thunderbird to PST account directly and safely or securely. This software is compatible with Outlook versions such as 2019, 2016, 2013, 2010, 2007, 2003 and etc.

See more details: https://www.kdetools.com/thunderbird/

 

The Mac PST to MBOX Converter Software is safe and capable for PST file to MBOX conversion. This tool simple to transfer your Outlook PST file to MBOX file format on Mac. This application can easily maintain email folders to restoring CC, BCC, To, From, and attachments. This software allows for providing a preview option. Also, it supports all Windows OS and Mac OS versions. You can download the free demo version tool.