Also try MacArmy PST Converter for Mac to easily convert PST files to PDF, Office 365, EML, MBOX, etc. in batch at one time. This software is workable on all Mac OS editions like High Sierra, EI Capitan, Big Sur, Mojave and many more. While uploading the PST files, you can use its dual options and checkbox options to easily select the PST files. Also gives an opportunity to save the resultant file in the desired location. Its demo version helps all users to test its functions and permits to convert first 25 files from each PST folder to required file formats without any cost.