How do I view an Outlook .msg file?

Building on Martin Owens answer, this is the quick solution:

wget http://www.matijs.net/software/msgconv/msgconvert.pl
sudo apt-get install libemail-outlook-message-perl libemail-localdelivery-perl libemail-sender-perl
perl msgconvert.pl YourMessage.msg

Looks like the best thing to do is to convert them to an eml file using this script:

http://www.matijs.net/software/msgconv/

It's not pretty, it's not gui based, but it'll work.

Open it with MsgViewer http://sourceforge.net/projects/msgviewer/

wget -O MSGViewer.zip http://sourceforge.net/projects/msgviewer/files/latest/download
unzip MSGViewer.zip
cd MSGViewer-1.9
java -jar MSGViewer.jar

now, just drag'n'drop the msg file to the program window to have its contents displayed.