If you want to convert PST to MBOX Thunderbird, eSoftTools PST to MBOX Converter Software is a good option. This is a fantastic choice. There are many quick, fast, and gentle acts in it. Email properties are preserved during the PST to MBOX migration. The PST to MBOX conversion program can transform addresses, contacts, calendars, attachments, tasks, notes, and more from PST to MBOX. The trial version is available to all customers and is completely free to download. In the demo edition, you can convert up to 25 email items per file.
Visit here:- Import PST File in Mozilla Thunderbird