Windows 2003 AD Synch

We have a 2003 domain and are running Domino 6.51. I am having problems synchronizing information between them using AD synch. In AD Users & Groups I have set the Lotus Domino Options and when I select a user and choose Synchronize With Domino it says it works but no fields are updated in the AD entry or in the Domino Directory entry.

All the documentation says Windows 2000 - no mention of 2003. Is 2003 supported?

Thanks