How do I get rid of error pop ups

Every time I load EMC I get the following error messages:
“Invalid Reply Format (no collection)” and "Synchronization Error (5201).  What am I doing wrong, or what can I do about this nuisance?
I have another query.  I converted from Windows Live Mail.  If I remove the WLM application will I still receive mail via EMC or would it create a further problem?