Klaus,
please stay on the mailing list (Cc:-ed) with responses so others can answer and learn as well.
ems@sparkassen-informatik.de wrote:
thank you for your clues (back-ldap/back-meta). Do you think it works as well if the embeddet other LDAP-Server ist an Active Diretory ?
Yes. You can find a lot of discussions about special configurations for proxying AD with OpenLDAP in the mailing list's archive. You could simply start with it and ask if you have specific issues.
Ciao, Michael.