PST file does not support Mozilla Thunderbird therefore user need a solution to change data in MBOX file format. We suggest user to download MailsDaddy PST file converter tool to export data from PST to MBOX, EML, MSG, HTML etc. in a few simple click. This GUI solution shows the preivew of email, folders and attachments before exporting PST file to MBOX. The application manages internal and external folder structure during the whole conversion. It comes with the free demo edition that moves up to 20 emails from each folder. After conversion, user can easily open in any MBOX-based email clients like Thunderbird, Apple Mail etc.