[ewilen]

You could run a GUI LDAP browser such as the one I suggested above, or use

ldapsearch -h <zimbra server> -x -b "<dc suffix of users you want to list>"

e.g.

ldapsearch -h zimbra.company.com -x -b "dc=zimbra,dc=company,dc=com"

It seems these days you're supposed to use the -H switch instead of -h. That would look like:

ldapsearch -H ldap://<zimbra server> -x -b "<dc suffix of users you want to list>"