I have this error when I'm using Outlook or Thunderbird address book LDAP :
"get_ssa: conn 9700 unknown attribute type=display-name (17)".

Outlook is correctly configured. With my old mail server I had a LDAP address book and there was no problem when I press ctrl^K (automatic completion).
With Zimbra (Open Source) I have this error.

Do you know this problem ?

Thanks in advance and sorry for my english