CubexSoft Mac MSG to PST Converter is the correct method to transfer all .msg files to  .pst files at once. This application adopts simple GUI Interaface which can be interpretable easily. No Outlooks installation is mandatory for the processing of MSG to PST conversion. You can download Mac MSG Converter on any Mac OS version like Catalina, Monterey, High-Sierra, etc. Free demo version of this tool is available for the users who want to see demo, 25 MSG files is able to convert into PST for free for demo purpose.