I've just done an install on CentOS4.2 - It's now in a config screen, that's got:

2) Ldap master host: mta2.mainframe.ca
3) Ldap port: 389
4) Ldap password: set
5) zimbra-ldap: Enabled
+Create Domain: yes
+Domain to create: mta2.mainframe.ca
+Create Admin User: yes
+Admin user to create: admin@mta2.mainframe.ca
******* +Admin Password UNSET

Do I set the Ldap master host to my AD server?