If you're looking for solution PST to MBOX Converter Online. That name is eSoftTools PST to MBOX Converter Software. It works in a few clear and easy steps. During the PST to MBOX conversion, email properties are maintained. To convert required emails from a PST file, the user simply needs to select the mail filtering option and choose the from and to dates. It can offer a free demo version that is also available for all customers. In the demo version, you may convert 25 email items per folder without any fee.
Visit here:- https://www.esofttools.com/pst-to-mbox-converter.html