For bulk conversion of EML files to MBOX, experts recommend the MailConverterTools EML Converter Tool. This software allows you to convert emails from Windows Live Mail(.eml) files to the MBOX format without any data loss. It is compatible with several email clients, including Windows Live Mail, Thunderbird, Apple Mail, Eudora, Entourage, and more. Users can easily convert large quantities of EML files into the MBOX format. The tool also provides a preview of all EML items before conversion. Also, users can convert EML to PST, CSV, PDF, HTML, DOC, and other formats with attachments. It supports all versions of Windows OS and MS Outlook.