If you could open your old names.nsf files, open it in LotusNotes, select every contact (and site documents if any), copy to clipboard. Then create a new NAMES.NSF file or use another one and paste all your docs in. That’s it Ruth adds: If you don’t have any addresses in your new contact book yet, you can rename that file to old names.nsf and put the old one in its place, as names.nsf. Only do this with Notes closed!! Then when you reopen, it will be the default address book again.