Here I found a converter that works to convert these messages into .mime format, which you can also read as text.
Instructions
- Download the script and put it in a convenient location.
- Install the necessary Perl modules by executing the following: cpan -i Email::LocalDelivery Email::Outlook::Message or
sudo apt-get install libemail-outlook-message-perl libemail-localdelivery-perl - Run perl -w msgconvert.pl YourMessage.msg
- A YourMessage.msg.mime file will be produced