I am running into a 'problem' with syncing users from ad. I'm pretty sure i'm doing something wrong but i can't figure it out.

When i sync manually the 'pop up' shows that it's synchronizing and after a few seconds it tells me "OK". But there are 0 users imported.
http://www.dualdude.net/bm/run_ldap_sync.jpg

The connection and credentials to access the AD work since they are also used for Zarafa and Samba AD synchronization. The AD is running on an Windows Server 2008 Enterprise x64 machine.

This is a screenshot of the configuration used:
http://www.dualdude.net/bm/ldap_config.jpg

Any thoughts on what i'm doing wrong?