This produced one long text file with all my contacts in it (c:Update.vcf). So I wrote my own VBScript, tailor made for the fields I wanted to export, but very easily customisable. Second, it is 2.0 format, and there are some fields Apple's Address Book would label unproperly (for instance, other address would become a work address). First, it misses a field I needed (other fax). Outlook does have a VBScript function to do so, but it is problematic.
Getting rid of duplicates in Address Book.
I learned quite a few things in the process. I spent a lot of time moving my contacts' info from Outlook on Windows to Address Book, and printing them out very nicely in PDF.