User has just received a new Mac with Office 2011.  We connect with Exchange 2010.  She is able to receive mail, but not send mail.  When she sends mail, it goes to her Drafts folder instead of being sent out.  Then she gets the following error:  Could not synchronize record:  SubjectLineOfEmail to Exchange server: XXXXX.  She is able to send mail via OWA without issue and had no problems sending mail from Outlook 2010/Exchange 2010 on her PC.  

She has right clicked on the folder that was having issues (my Drafts folder), selected "Properties" and under "General" clicking "Empty Cache".  Nothing happened when she performed this action.  

Also had her go to Finder, search on the title of the meetings or mails that are in the error messages and delete the files in question. She has tried to do a few at a time and it does not go away.

I have seen suggestions to delete and recreate the Identity, but then see other posts where this does not help.  

I appreciate your help.