How to convert Outlook PST file to MBOX format? Launch the PST to MBOX Converter software and understand the complete solution on how to convert Outlook PST file to MBOX format with all email properties, formatting and along with attachments. This software comes with preview facility to view and read selected data files before final process. MS Outlook installation is not mandatory to perform with this software. It has supports simple and easy GUI, so anyone can easily handle and works with this software without any technical knowledge. It compatible with all the latest and below versions of MS Outlook and Windows OS.