ChangeAuditor for Active Directory is not auditing Exchange events that occur on the Domain Controller
ChangeAuditor turns on or off events according to licenses applied. In order to audit any Exchange event, the ChangeAuditor for Exchange license is needed. You can see what events these are on "Administration tasks" | "Auditing" | "Audit Events". The License Type Column specifies what license is required.
A ChangeAuditor for Exchange License is required for all Exchange events.
