If you are having orphan MBOX files and now looking for a way to convert MBOX file to PDF. As you know that both these file formats have no similarities so, there is not a direct method to export MBOX to PDF. If you are having MBOX files of these applications like Opera Mail, SeaMonkey, Mozilla Thunderbird, Apple Mail, Horde Mail, Eudora, Postbox, etc. As a user you would face no problem to convert MBOX to PDF.