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I have received a .msg file as an attachment from a coworker. I am using OS X and there are no default programs to open the file. Does anyone know how I can open a .msg file on my Mac?

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Outlook for Mac unfortunately cannot read these messages, it seems.

MailRaider is a program that should be able to read those files just fine. It's available for $1.99 on the App Store. It used to be free, so you might find old versions somewhere.

Are you a Switcher? Have you got old e-mails archived somewhere? Have you ever wished that your Mac could read your old Microsoft™ Outlook .msg files? If so, MailRaider could be just what you need.

It should be able to read the files and even save attachments. You can find the documentation here (PDF).

Here's a caveat about files that don't originate from Outlook:

Sadly, there are many other programs out there which use the .msg file extension. If your .msg file wasn’t written by Microsoft Outlook then MailRaider won’t be able to read it. If you’re able to open the content in an editor like TextEdit then it may be that the file will open happily in Apple Mail if you just change the extension to .eml.

Other applications you could try are Outlook MSG Viewer (only a free trial) and Klammer (also not free).

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MailRaider is no longer free : "The standard version is available for a small sum of money on the Mac App Store" 45rpmsoftware.com/mailraider.php – bluevoodoo1 Apr 22 '14 at 16:05
    
@bluevoodoo1 Thank you for the notice. I updated my post. – slhck Apr 22 '14 at 16:44
    
FYI Microsoft outlook for Mac, cannot read msg files - at least until now. – gred Oct 16 '14 at 15:29
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@gred Bummer. Thanks for the info; I've removed that statement. – slhck Oct 16 '14 at 15:34

I can recommend the free Java program MSG Viewer, available from Sourceforge.

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Please read How do I recommend software for some tips as to how you should go about recommending software. At the very least you should provide more than just a link, for example some additional information about the software itself, for example how it can be used to solve the problem in the question. – DavidPostill Jul 13 '15 at 15:24
    
Thank you @Michael, exactly what I wanted ! – Vahe Harutyunyan Sep 3 '15 at 7:15

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