Since the upgrade to the new 2013 layout my mac clients have this issue:
When they open their address book and look in all contacts they see an awful list of suggested contacts. However, these contacts are only seen in the mac adress book, not on mobile devices, outlook pc, outlook for mac, not in OWA.
But they get synced, because people with multiple mac, do see the same list, and when we delete one of these contacts it's deleted on the other mac adress book too.
The list is only viewable when you look in All Contacts. No if you just look in you Exchange addres book.
We've investigated this issue and found out that other mac clients who are on an Exchange 2013 server have the same issue....
For the record: the users are using apple mail and apple address book not outlook for mac.