Converting OST files to EML file format seems a bit difficult. But actually, it is an easy process. You can use Magus OST to EML Converter for quick conversion. Magus tools can easily export OST files to EML format to access OST emails in Mozilla Thunderbird, Windows Live Mail, Lotus Notes, Windows Mail, Microsoft Outlook 365, etc as per the user requirements. Data security and hierarchy of the folder are always maintained during the process. It exports all the details associated with a mail. Also, it helps you to download the attachments separately if needed. Learn the simplest way to export Outlook OST to EML File format.
Just use thunderbird addon