I did this after I 1st switched to IMP3. I exported my Contact List from Outlook 2000 to a csv file I think it was, then modified it a little in Excel, then Imported it using the tool provided in the Addressbook of IMP. It did take some playing with, but got the job done. I probably could have typed everything back in quicker then it took to do the rearranging and importing, but the final result was the same.
Terry