As I wrote, address book download mechanism and synchronization works fine. I double checked.
For interest I opened GALContacts.db and found many domain user entries there.
Actually its works even better I have experienced. I guess how it should work - I see only users enabled for communications and distribution groups. I would like this every time.
On other OCS 2007 installation I made, when use address lookup I see all users even if they are not enabled for communications.
Only difference I can see - other installation was on single domain (abc.net), but this is on single forest with empty root domain (abc.abc.net) and few child domains.
I just want clear view about when users appear or not appear in office communicator address book lookup and the role of msRTCSIP-UserEnabled attribute in this context.