I have the 2011 Office Suite for my new iMac. I work on a PC at work. So, if I email myself a Excel file from work to home, open it in my Outlook on my Mac, save it to my desktop, it won't open....says its corrupt. What am I doing wrong? All the files I send from my Outlook on my work PC come over to my home Outlook on my Mac as windat files. HELP 