You can use the MacMister Mac Apple Mail Converter Tool, that's compatible with all Mac OS as well as Outlook editions, if you're still searching for the easiest and most straightforward way to move Apple Mail to PST for Mac OS operating system. This powerful program allows you to convert Mac Mail data into PST format in both bulk and selective ways. Users may easily transfer Apple Mail emails, tasks, calendars, etc. into PST format in bulk with just one click due to its user-friendly interface. There is also a free demo available to test how the tool works.