If you can't copy the MSG messages into a PST first and you still need to open a MSG file on a Mac, then my recommendation is that you resort to one of these solutions: converting the MSG file to a supported mail format, like EMLX or MBOX, or even easier: installing third-party tools that are specialized in opening and viewing the contents of a MSG file, the so-called "MSG viewers". Since only Outlook for Windows uses the MSG format, then, if you have access to a Windows computer with an Outlook installation, you may use that to copy the MSG messages into a PST file first, and then transfer that PST file and import it into Outlook for Mac.
Mailraider mbox for mac#
Not even Outlook for Mac can handle MSG files as it should, as MSG is a format specific for the versions for Windows of Outlook and Exchange. Installing an additional fully-featured e-mail client on your system, the one that also supports the MSG format, is not exactly a valid solution in my opinion, simply because I couldn't find the one that clearly and flawlessly supports directly importing and viewing the contents of MSG files, and I've checked acknowledged names like AirMail, Mail Pilot, Postbox, MailMate, Unibox, Polymail, or even Thunderbird. That's mainly because the Mac systems rely on Apple's proprietary mail app, uninspiredly called simply "Mail", and its capability of importing additional formats for files that store mail data is rather limited. Even if they are quite widely-used, opening MSG files and viewing the mail data that they contain on a Mac system is a bit complicated. MSG files are used for archiving and storing e-mails and other mail data by applications like MS Outlook and MS Exchange.