Outlook Express for OS 9 seems to export contacts in a non-standard format (go figure). It looked like it was LDIF format, but I don't think it was because Address Book was refusing to import it. I was trying to find programs that would do the import, but then I found an easier way:
- First use Outlook Express to export the whole address book.
- Go into the Netscape Communicator 4.7x folder (this is, by default, installed with OS 9), open up the "Import" folder, and use the Import application to "import" the Outlook Express address book and immediately spit it back out as a standard LDIF file.
- Go into Address Book and import the converted address book file.

