Address Book Importer
has been released by Apple. It’s a Mac OS X application that enables you to import LDIF files to your Address Book application in Mac OS X.
LDIF files are created when you export address book info from applications like Netscape Communicator. Address Book, meanwhile, is an application included by Mac OS X that enables you to keep track of contact information for family, friends and colleagues.
Address Book Importer has been tested with Netscape Communicator 4.7x; Netscape 6 does not support LDIF export. System requirements call for Mac OS X 10.1.