Looking for a straightforward solution to export MBOX file to PDF file format then you can use Mozilla Thunderbird. Thunderbird has add-on feature to import and export mailbox into PDF file format at once. For other conversion options like MBOX to PST, Office 365, EML etc. try MailsDaddy MBOX to PST Converter tool. The free demo edition of the software moves up to 20 emails from each folder.