To enable LDAP authentication you need to set at least these defaults:
<pre>
Defaults write NSGlobalDomain \
  LSAuthLDAPServer '"myserver.de"'

Defaults write NSGlobalDomain \
  LSAuthLDAPServerRoot '"dc=opengroupware,dc=org"'
</pre>
<p>
  This makes OGo use a simple bind (<tt>ldapsearch -x</tt>) against the
  LDAP server to check credentials. OGo currently uses LDAPv2 for maximum
  interoperability.
</p>
<p>
  Note that with LDAP authentication enabled OGo still needs to create an
  account record in the PostgreSQL database. This is done when a user logs
  in the first time and was successfully authenticated by LDAP (the user is
  taken to a welcome-page where he can decide whether to proceed).
</p>