Use the MBOX to HTML converter application to convert your Thunderbird MBOX message storage file into a set of separate HTML files. The MBOX to HTML Conversion application will pack generated HTML files into a ZIP archive.
MBOX is the email message container. It stores message collections. MBOX is often used to backup email accounts. It is supported by Thunderbird and other applications. MBOX is a text format, so simple messages are human-readable using a notepad-like application.
HTML files store formatted text with hyperlinks, images, styles, and scripts. HTML files could be viewed by web browsers and some other viewers. Email message body can also be represented as HTML text. HTML email message body is convenient for email marketing and formatted email signatures.
You can also convert Email Mailbox file into many other formats. Please see the list below: