How do I unlink my address book in Outlook Express from the 4 identities that I have?

Example:

Identity A has 10 contacts

Identity B should have 3 different contacts

What happens is that both Identities have 13 contacts.

When I delete a contact from one identity it is deleted from both.

At one time I exported my contacts using Outlook so this may be part of the problem.

Thanks for any advice!