How to import PST to Thunderbird without Outlook?
If you want to understand how to use "PST to Thunderbird without Outlook," I recommend getting the eSoftTools PST to MBOX Converter. You can get things done quickly and effectively if you use it. Before beginning the conversion, it displays the elements of the PST file in real-time. Windows 10, Windows 8, Windows 7, Windows XP, and all previous versions of Windows are supported by the software. In the new free trial version, you can convert up to 25 emails per folder. If you have any concerns or problems, please contact our technical support team.
Visit here:- https://www.esofttools.com/pst-to-mbox-converter.html

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sonali raj commented
If you want to convert PST without Outlook then this Outlook PST Recovery Software is the best way to accomplish the task. check out the tool. https://www.magustools.com/pst-conversion/mbox.php
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Kiran Sharma commented
To import PST to Thunderbird easily and securely, use the MacSonik PST converter for Mac. This advanced tool helps to convert/migrate multiple PST files at once in just a few clicks. It supports to preview of the PST files before the conversion process. The Outlook PST converter also provides an option to convert PST files to 18+ file formats and email clients. Its user-friendly interface makes it easy to use for both technical and non-technical users.
To know more- https://www.macsonik.com/pst/converter/