Dennis,
I just tested this with OL2000. Using the Address book to enter contact, I
got to 6 and quit. If you simply have to enter directly into Contacts, go to
the All Fields tab, choose User Defined fields in the Select from box, click
the New button, name it E-mail 4 (5,6,7 etc) and select Text for Type and
Format.
Hope this helps. Please post back either way.
Good Luck