I believe that using the eSoftTools PST to Thunderbird Converter Software to import Outlook PST files into Mozilla Thunderbird is the best option. With a few mouse clicks, it can import a pst file into Mozilla Thunderbird. It may also import multiple Outlook PST files into Mozilla Thunderbird. The software has provided a trial version without paying money. In the trial version, you can convert 25 items of every folder and technical support is also available here at any time.
For more information:- Import Outlook PST File to Mozilla Thunderbird
