LDAP Sync Replication with Active Directory

Hi, I have a Win 2k3 SBS and I want to replicate the users into my OpenLDAP 2.4.11. When I start slapd, I can see that one entry of a user is being sent, but after that I get the message "got search entry without Sync State control". I had hoped that replication not only works with OpenLDAP as a master, but also with Active Directory. Is it possible to get this to work? Lars