I'm trying to run an AppleScript by Ed Asmus for office Outlook 2011 for Mac and then having problems.  The reason I'm trying to run the AppleScript is to remove duplicate and sometimes triplicate copies of contacts.  When I run the AppleScript I get the following error message

Microsoft Outlook got an error: Cannot delete this item number -10003 from contact id 5578

My questions are:

1. How do identify what I am assuming to be the problem contact under the ID "5578"?
2. Can I manually remove this problem contact ID?
3. where did these duplicate contacts come from?
4. how do I prevent them from returning?

Thank in advance for any assisttance