HELP!!  I just spent 30 minutes on hold with MS Technical support to get a person that had never heard of the Winmail.dat issue.  Can someone please help me? My calendar invites used to work up until 2 weeks ago. Now when someone sends me an invite it it a winmail.dat attachment that I cannot open. Pls don't send me the link with the expalianation from Barry Wainright. I have 2011 and he only goes as far as 2010. I am a very basic user. I don't know how to find nor clear cache mail in this software. At this point, I'm wishing I had a PC back. At least I'd get something done.