A PST (Personal Storage Table) file is a proprietary format used by Microsoft Outlook to store copies of messages, calendar events, and other items on your computer. In contrast, an MBOX file is a more universal format used by numerous email clients, including Mozilla Thunderbird and Apple Mail, to store email messages. The fundamental difference in these file structures necessitates ... https://froodl.com/free-pst-to-mbox-converter---convert-outlook-pst-files-easily