You can import address book contacts from a variety of popular Internet e-mail programs such as Netscape Communicator, as well as from Microsoft Exchange Personal Address Book and any text (CSV) file. For example, in Microsoft Outlook, you can export your address book to text file (CSV) format, and then import it using that option.
If your address book is not listed, you can export it to either a text (CSV) file or an LDIF (LDAP Directory Interchange Format) file, and then import it using one of those options.