You should try the PST to MBOX Conversion if you're looking for a free eSoftTools PST to MBOX Converter Software. This also began to work in a very direct, clear, and dynamic manner. The program works with both new and old versions of Microsoft Outlook. Convert encrypted/password-protected PST files to MBOX with ease. We are here to help. Immediate is available 24 hours a day, seven days a week. There is a free trial version of this software available for all customers. In the trial version, you can convert 25 email items per folder without any price.
More information:- Convert PST File to MBOX Format