Best way to Convert MBOX Files into PDF Format? Then I would like to suggest you also try CubexSoft MBOX to PDF Converter to Convert MBOX Files into PDF format. It is a versatile utility with an easy-to-use interface that supports both technical as well as non-technical users. The tool works with all MBOX-based email clients and smoothly converts MBOX to PDF. Users can capable to convert any size of MBOX file to PDF without any restrictions. You can try the trial version of the software to test the features and skills.