I have a user that has attached 5 files one .pdf couple of .docx one .doc and one .xlsx 
Domain environment with exchange 2010 
Files are sent from microsoft windows office 2010 win7 machine.
The files show up on win7 microsoft outlook 2010 fine no problems 
When sent to a macbook pro with Office for mac 2011 Outlook for mac it shows up with a .dat file attached and no office files.

I have a MacBook so I suggested that the user send it to my email and I would check out the problem on mine and troubleshoot it from there!
I was expecting to see the .dat file so I could trouble shoot it but to my surprise the office attachments were there same mac OS same  office for mac

Any help or direction would be greatly appreciated 
Thanks in advance 
John R