I've been following these threads, and I was a big fan of the move to CardDav in lieu of the iSync connector.
However, I am still getting duplicated contacts, thousands if it is not kept in check.
I don't understand where it is coming from, at first I thought Address Book was causing it, but it seems to me to happen on a timed basis. In other words, over the course of an hour or two it'll duplicate 10 or so contacts. It seems to pick contacts that are recently added, and it will continue to duplicate the same contact, even after it has been cleaned up.
I'm beside myself as to what to do. It keeps happening. I started to blame iOS devices, but those are all now running only CardDav, and I've killed the ActiveSync.
So I'm stuck. Any ideas?