One of the best ways to open PST files in Thunderbird is to use eSoftTools PST to MBOX Converter Software. Using this application function, you can export your emails in MBOX format. This tool can be used to improve Outlook data. PST files to MBOX are converted into a variety of file formats, including MBOX, EML, EMLX, TGZ, ICS, and vCard, and the user interface is simple enough for non-technical users to utilize. Everyone will be able to test it for free. In the demo version, you can only change 25 email items per folder, but you can always get free technical support.
Know more:- Open PST File in Thunderbird