There are many third-party apps available in the online market, which can help you convert PST files to MBOX easily, fast, and without complicated methods. But here I recommend you to use MailsDadddy PST to MBOX converter to convert PST files, which in my opinion is a reliable and useful solution. It allows converting PST files to multiple formats without any data loss or data corruption. This application can support the latest versions of MS Outlook from 2019, 2016, 2012, 2010, 2007, and earlier. All users both technical and non-technical can easily the tool and convert PST to MBOX bulk and filter form.