How do you fix double import problem?

I have been using Windows Live Mail ( Yesterday I installed eM Client 5. Not realizing that it was importing my MSN data I went to the File menu and did a manual import of the MSN acct. Now I have two MSN accounts in eM Client. One is missing a years worth of messages. In the other I defined a large email distribution list that I don’t want to reenter. What is the best way to fix this problem?