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Dear Nick, Dave and Patrick,
Using the /etc/openldap/slapd.conf.bak file did the trick. I just needed to add:
# Kopano extension
include /etc/openldap/schema/kopano.schema
+ rename it to slapd.conf and make it owned by ldap:ldap. I think this will also solve Gordon's problem.
Thanks again.
Best wishes,
Robert -