I think that WholeClear MBOX to PDF Converter is the best way to convert MBOX files to PDF. With just a few clicks, the program can convert MBOX to PDF. It has many advanced filter choices that let you export MBOX emails to PDF based on date range, to, from, subject, and other factors. During the process, it keeps the accuracy of the data and the folder structure in the mailbox. It works with multiple MBOX-supported email clients such as Thunderbird, Apple Mail, PocoMail, Opera Mail, etc. It has various features like bulk conversions, free demo, 24x7 free technical support, supports all Windows versions, easy and simple user interface, etc.