If you want to import Outlook OST to thunderbird. So you can try the eSoftTools OST to PST Converter tool. This tool migrates all emails into thunderbird like inbox, sent items, drafts, notes, journals, tasks, contacts, appointments, etc. this tool supports ANSI and Unicode format. It also imports Outlook OST files into various formats PST, EML, EMLX, MSG, MBOX, OFFICE 365, HTML, MSG,vCard etc. Users can download a free demo file to import Outlook OST to Thunderbird format.
Read More:- Import Outlook OST to Thunderbird
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