Some of the RECIPIENTS of my brand new OfficeMac Outlook 2011 are sending my emails back with a message that says: "This message is in MIME format. Since your mail reader does not understand this format, some or all of this message may not be legible."  Yikes!  I've had Outlook 2010 on my PC for eons but have never heard of this problem... Helllllllpppppp!  (thanks :)