If you want to do a complete one time export of your Outlook contacts and import them into you Mac Address Book.
From Outlook Select all your Contacts
Click Actions > Forward As Vcard
This will compose a New Email with all your contacts as separate Vcards. Then send the email to yourself, or any other email address you can check.
Download all your attachments into a separate folder, so you can select all in the next step
In the Finder Select all your Vcards and then just drag them into Address Book. Or you can go into Address book and File > Import > Vcards
