Convert MBOX File to PDF from WD Hard Disk

I am having multiple MBOX files ( I think that was creating by my Thunderbird acoount in past ). I took a backup of them to my WD Hard disk . How can I Move them disrectly to PDF . I am not aware how i can access them back ?

Since MBOX file is readable with MBOX supported email Application , you can either install Thunderbird email Client or go with BitRecover MBOX to PDF Wizard which is also very usable.
Hope it is helpful!