How to convert PSt to Thunderbird Format?
If you're looking for something, for a PST to Thunderbird Converter free download so you should try the eSoftTools PST to MBOX Converter Software that is available for free download on our website. It is the best tool I've used in my experience. The steps are very clear, simple, and gentle. Before beginning the conversion task, it displays a live preview of the PST file elements. The trial edition is also open to all users, and it converts 25 email items per folder at no charge.
Read more:- https://www.esofttools.com/pst-to-mbox-converter.html

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ChrisTwitty commented
The best way to change the PST to Thunderbird is by changing the PST file into MBOX format, which is compatible with Mozilla Thunderbird. Thunderbird does not support PST files at all; hence, the best way out is a professional Outlook PST converter. To convert your Outlook PST file to MBOX, you can get the assistance of a dependable tool such as BLR Tools PST Converter without installing Outlook.
After this conversion is done, you are free to import the MBOX file into Thunderbird with the help of the add-on called ImportExportTools NG. Just as you simply need to install the add-on, and then right-click any folder in Thunderbird, and finally, select the option to import MBOX file and pick your converted file. In this technique, your email information is maintained by keeping attachments along with the structure of folders.
Click here: https://www.blrtools.com/pst-exporter-tool.html