If you want to recover a corrupted OST file and convert OST to Thunderbird then you can try the eSoftTools OST to MBOX Converter software. It can recover all email data- inbox, draft, sent-items, notes, task, journal, appointments, contacts, calendar etc with all email attachment- to, cc, bcc, subject, time ,date. Users have many options to convert OST files into PST, EML, EMLX, HTML, office 365, MBOX, MSG, and another format. This tool splits PST files into small PST folders. OST to MBOX converter tool is based on GUI(graphical user interface) and supports ANSI and Unicode format to recover outlook OST files.
Read More:- Convert OST to Thunderbird