You can open a pst file in Thunderbird with the help of eSoftTools PST to MBOX Converter Software. The installation and selection of the pst file are simple. It is easy to follow and achieve its methods. It also displays live previews and maintains email properties during the conversion from PST to MBOX. It gives Live Preview facility to all users. All users can convert up to 25 e-mails into each folder in a free trial edition.
Visit here:- Import PST File to Thunderbird