kolab integrate with existant ldap

[pub at grizzli.org]

Hello,

I'd like to install kolab in our organization but there is already an
independant openldap server we manage to keep track of the users.

Is there a way to make kolab in sync with this ldap server ? (this to avoid to
use the web interface to add & remove users)
Has anyone an experience with that ?

Thanks,

Mike