"How do I convert PST to Thunderbird?" is a simple question with a simple answer. eSoftTools PST to MBOX Converter Software is the official name of the program. The files can be easily converted using any third-party tool. It's moving quickly and in simple steps. The software can convert any type of PST file in a very short amount of time. The tool also allows the user to specify a destination path for the generated files. For all user a trial edition is now available. Users can convert PST to MBOX file format with 25 objects per folder in the demo version without purchasing the full version.
More information:- Convert PST File to Thunderbird

Convert Outlook to Thunderbird
Find your local . pst and . ost files.
Open your . pst and . ost files.
Convert your emails to mbox or eml format. Select mailbox root folder in All folders pane, and click File > Export. Choose MBOX file format and click Ok.
Find your Thunderbird "Local Folders" Directory. Launch Thunderbird.
This may help you,
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