If you'd like to convert PST to MBOX Format, you should try the perfect tool available: eSoftTools PST to MBOX Converter Software. Only a few more steps are needed to clarify this. Both ANSI and UNICODE PST files are accepted for conversion. The program works with both new and old versions of Microsoft Outlook. The trial version is also available for all customers, and in the trial version, you can convert 25 email items per folder without any price. For more information:- Convert PST to MBOX Format