Outlook for Apple Mac 2011

When I try to access emails stored on my remote central data base they are shown as .msg when I attach any of these files to my emails door sending it still shows as a .msg

These files have been saved onto this remote data base using the outlook 2010 format and only seems to be an issue with the Mac 2011 office.

Does any body know if there is a setting in outlook 2011 I need to go to? Sending emails with .msg is not an option for my clients as they are unreadable.

Any solutions

Thanks