Opening .msg file in Outlook for Mac 2011 Most of my colleagues use Outlook on Windows and I need to access emails stored in .msg format (don't ask, it's complicated).

My understanding is that .msg is an Outlook file format, but Outlook 2011 on Mac can't open them.  When I right-click on the file and ask to open with Outlook, it creates an email with the .msg file as an attachment.  Using various dragging and trying to open with the file menu also don't help.

Any ideas on how to open these on Mac?  Preferably without having to install additional software.
For everyone in 2016 who is also looking for a free software without IAPs and similiar "problems" (MailRaider for example was free years ago):

MSGViewer is a free software, which can be downloaded via sourceforge. It does, what the name stands for: viewing / showing the content of the msg files! I just tried it after browsing for a good software that does not cost 10 Dollars or more and I can recommend it.

MSGViewer SourceForge link.

Edit:
Just had an .msg file with images inside: msgviewer is also capable of showing them.