How to Import a PST File to Thunderbird?
The eSoftTools PST to MBOX Converter Software, which can be downloaded for free, is an ideal alternative for converting PST to Thunderbird. With the PST to MBOX Converter Software, exporting Outlook emails to MBOX format for later use is simple, and this application is cloud-based like Gmail, Yahoo, and Office365. There are only a few steps left in this process. It is possible to convert PST files to ANSI or UNICODE formats. The software supports both Microsoft Outlook 2007 and older versions. Customers with little or no technical skills will use the tool. You can move 25 emails from each folder during the free trial.
For more information:- https://www.esofttools.com/pst-to-mbox-converter.html
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Priyanka commented
If you are struggling to export Outlook emails to Thunderbird then I suggest you the best and most trustworthy tool which is MailConverterTools PST Converter. It allows users to import PST files to Thunderbird and other email clients for instance Gmail, Yahoo, Office 365, Live Exchange, and so many others. Additionally, this tool can convert PST files into different file formats such as PDF, MBOX, EML, MSG, CSV, etc in bulk. Furthermore, it includes an option to maintain the folder hierarchy according to the original files, and it is compatible with all Windows versions.
To know more: https://www.mailconvertertools.com/outlook-pst/