Use PST File to MBOX Converter tool, which can help you to converts Outlook files to MBOX file format with attachments. This tool manages the folder hierarchy which allows user to save their converted PST files into MBOX format into same folder structure according to their choice. It has very simple user friendly graphical interface, users can easily handle and work with software without needed any technical knowledge. There is no file size limitation, you can convert number of files at a time without any problem. This software supports all the Windows editions like 11, 10, 8.1, 8, 7, etc. editions.