Very Computer

I'm using KAddressBook version 3.1 and I'm having trouble to access
our Windows LDAP server.
My configuration is set up to run on port 3268. If I leave the base DN
field empty and I search after something. I only get the schema: in other
words the builtin groups, not the users themselves.
I've tried everything possible in the base DN field, like
DC=chs-augustin,DC=com etc... but with no luck, KAddressBook finds
nothing.
Where is the problem with my config. Has anybody makes experiences with
LDAP?

Thanks in advance
Marco Augustin