Yeah, I think so because I did it at some point. Here's how I THINK that I did it before.....let me know if this works.
First make a new empty folder on your desktop. Then go into Entourage, and open the contacts section. Make the window small enough so that you can see the new folder that you made on the desktop. Now drag all of your contacts to the folder that's on your desktop. This doesn't remove them from Entourage, it just makes vCards of them in that new folder.....(they'll have ".vcf" in the filename).
Now all you have to do is import the contents of that folder into Addressbook.
Comments
First make a new empty folder on your desktop. Then go into Entourage, and open the contacts section. Make the window small enough so that you can see the new folder that you made on the desktop. Now drag all of your contacts to the folder that's on your desktop. This doesn't remove them from Entourage, it just makes vCards of them in that new folder.....(they'll have ".vcf" in the filename).
Now all you have to do is import the contents of that folder into Addressbook.
Enjoy~
Drew