When you configure resources, you will specify which entries to synchronize based on their object class. Object classes determine which attributes will be available to synchronize for both Directory Server and Active Directory.
Object classes are not applicable for Windows NT.
Identity Synchronization for Windows supports two types of object classes:
Structural object classes. Every entry that’s created or synchronized from the selected Directory Server must have at least one structural object class. Choose a structural object class from the drop-down menu. (Defaults to inetorgperson on Directory Server and to User on Active Directory.)
Auxiliary object classes.
Directory Server allows you to select one or more object classes from the Available Auxiliary Object Classes list to augment the selected structural class. The structural class provides additional attributes for synchronization.
For instructions on configuring object classes and attributes, see Chapter 7, Configuring Core Resources