I started this Mac App project in early 2017 that uses AppleScript to export/archive mail messages from Microsoft Outlook for Mac. I was looking for beta users right as my family abruptly moved to a new city. I haven't made time to touch it since. It essentially went from close-to-baked to mothballed. I'll share it here with the caveat that it does not actually work at the moment due to an AppleScript-related error. If there's enough interest in the idea, I'll find time to look into that!