How Do I View an Outlook. Msg File?

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

wget 
sudo apt-get install libemail-outlook-message-perl libemail-localdelivery-perl libemail-sender-perl
perl msgconvert.pl YourMessage.msg

Open it with MsgViewer

wget -O MSGViewer.zip 
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.

I am on Ubuntu 15.10 and matijs'es msgconvert script seems to be available in the repos now. after running:

sudo apt-get install libemail-outlook-message-perl libemail-localdelivery-perl libemail-sender-perl

I can now now run

msgconvert *.msg

to convert the messages entirely with tools from the repos.

I found after install msgconvert that msgconvert wasn't installed when I ran the command. Rather than faff about trying to debug it, I did this. Done in less than a minute.

You can use ruby-msg ruby gem for that purposes. So:

1. Install ruby and rubygems:

   # apt-get install rubygems gem
   

2. Install the gem:

   # gem install ruby-msg
   

3. Then use the "mapitool" utility:

   $ mapitool -i test.msg
   

   In some cases you can sporadically get the exception:

   /usr/local/share/gems/gems/ruby-msg-1.5.2/lib/mapi/mime.rb:109:in `join': incompatible character encodings: UTF-8 and ASCII-8BIT (Encoding::CompatibilityError)
   

   So just fix the following file lib/mapi/mime.rb with the following regexp:

   sed 's/part.to_s(opts)/part.to_s(opts).encode("UTF-8", :invalid=>:replace, :undef => :replace, :replace => "")/' -i /usr/local/share/gems/gems/ruby-msg-1.5.2/lib/mapi/mime.rb
   

With SeaMonkey program, Link please see below:

You can try using an online viewer such as:

It displays the .msg message, provides download links for the attachments, shows the headers, and converts the file to .eml.