What is the "Object Class" in the Set Filter (in the Specify Source Scope and Specify Target Scope under the Directory Synchronization) mean?
The Object Class is referring to the object that is available to sync. If the check-box is being selected next to the object class, this mean the object will include in job synchronization.
For example:
If "Computer" object class had been selected, this mean Computer object will be synced by the Directory Synchronization.
