Solution 1:

This is an MS-Outlook format. There is a command line tool called MSGConvert (see www.matijs.net/software/msgconv) which converts .msg files into .eml. You can open those with Thunderbird or Evolution. On Ubuntu you should be able to install the tool using

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

from a command line. Use

msgconvert *.msg

to convert every file in a directory at once. MSGConvert will produce copies of your .msg-files with the suffix .msg.eml. Regardless, your friend should learn how to send content properly.

Solution 2:

Hie, Even though there are a lot of Answers available but not of them are simple and easy to use so I am posting this Answer.

Use Microsoft one drive to open .msg files online via browser

Sign in to your Microsoft onedrive account and upload the .msg file. After upload, you can click on it to view the file contents.

and advantage over other answers is you won't be sharing your file with third party file converters.

Note: This method is Non-OS specific and can be applied in any OS.

Solution 3:

It's not perfect but you can import .msg file with Mozilla Thunderbird (it works with on 52.1.1 on my Linux Mint). I had some encoding error but you can globally read the content.

In Thunderbird you click on File > Open > Saved message and select your .msg file.

Solution 4:

Try this link: https://www.coolutils.com/online/Mail-Converter/

I came to this post searching for an answer, found the above link which did the job for me. Hence wanted to share here.

If you are concerned about privacy, you can buy their desktop version and convert it.