If you're serious about learning how to "Convert PST to MBOX Converter," I recommend using the eSoftTools PST to MBOX Converter Software. To render smooth PST to MBOX file conversion, it uses a very quick and clean graphical interface. Both ANSI and UNICODE PST files are accepted for conversion. The software works for both new and old versions of Microsoft Outlook. All PST to MBOX Converter customers can use the free demo to transfer up to 25 emails from each folder without paying anything.
For more information:- Convert PST File to MBOX