If you wish for the Primary eMail Address to be the business address, then you need to resolve this issue in Lotus Notes by setting the Primary eMail Address to the business address. To do this you need to;
1) Edit the Contact in your personal address book
2) Click on the EMail Hyperlink
3) Set the Primary Internet Address to the Business email address
4) Re-migrate the contact.
In this scenario MFNE/NME is operating as designed.