Download of PSTConverterPro 3.8 for Mac was on the developer's website when we last checked. We cannot confirm if there is a free download of this app available.
Please check the Mac app with an antivirus before launch as it is downloaded from the developer's website, and we cannot ensure that it is safe. The software lies within Communication Tools, more precisely E-mail. The actual developer of this software for Mac is GladWev.
From the developer:
PST Converter Pro is an easy to use but powerful utility to convert your Microsoft® Outlook PST file contents to common standard formats [MBOX (.mbox), vCard (.vcf), iCalendar (.ics), Apple Mail Archive, Microsoft® Entourage Archive and EML (.
You may want to check out more software for Mac, such as MacMassMailer, AdvancedMacMailer or iMailist, which might be related to PSTConverterPro.