A few days ago I wanted to copy a Word document with pictures from my PC to my MacBook.  So I sent an email with a large attachment from my PC Outlook 2010/Hotmail email, which I then later on opened in Outlook/Hotmail on my Mac.  My MacBook Pro Retina running OS X 10.7.5  with Outlook 2011 for Mac. Since then this 28MB mail has been sending itself every 20 minutes or so on the Mac only.  The repeated mail doesn't show up on my PC and it doesn't show in the Mac Sent box.  I.e. the only place I can see that mail again and again is in my Mac inbox.  This is obviously driving me crazy so any ideas would be most welcome