Here is some more info on this:
zimbrausers is the address group which used to contain the single user. The last entry is what shows up when I view the Address book through he web interface. When I search the address book for "zimbrausers" I only come up with the group.
$ zmmailbox -z -m
myaccount@domain.com autoComplete zimbrausers
Ranking type email
-------------------------------------------------------------------
6 contact "zimbrausers" <singleuser@domain.com>
0 group "other user" <otheruser@domain.com>, "other user2" <otheruser2@domain.com>, "other user3" <otheruser3@domain.com>, "other user4" <otheruser4@domain.com>
$ zmmailbox -z -m
myaccount@domain.com autoComplete singleuser
Ranking type email
-------------------------------------------------------------------
6 contact "zimbrausers" <singleuser@domain.com>
$ zmmailbox -z -m
myaccount@domain.com autoComplete
sinlgeuser@domain.com
Ranking type email
-------------------------------------------------------------------
6 contact "zimbrausers" <singluser@domain.com>
$ zmmailbox -z -m
myaccount@domain.com autoComplete lastname
Ranking type email
-------------------------------------------------------------------
0 contact "singleuser lastname" <singleuser@domain.com>
If I view my Address book with the command: $ zmmailbox -z -m
myaccount@domain.com getallContacts
for singleuser the entry is:
Id: 43343
Folder: /Contacts
Date: 12/29/09 15:24
Revision: 49437
Attrs:
lastName: lastname
email:
singleuser@domain.com
firstName: singleuser
and for zimbrausers its:
Id: 16680
Folder: /Contacts
Date: 12/29/09 15:23
Revision: 49436
Attrs:
nickname: zimbrausers
dlist: "other user" <otheruser@domain.com>, "other user2" <otheruser2@domain.com>, "other user3" <otheruser3@domain.com>, "other user4" <otheruser4@domain.com>
fileAs: 8:zimbrausers
type: group