Application to edit Windows address book contacts?

I have recently imported all my Nokia phone contacts into the Windows address book (WinXP). All these contacts contain not more than the Name and number. In the address book there are already one million email addresses. When I imported the Nokia contacts they did merge together which was good, but I still have lots of duplicates and alternative names and email adresses floating around I’d like to merge into existing names. I am preparing the address book for the iPhone that I have coming. I want to know if there is a better application that can help me merge and edit contacts on the computer.