Overview #In Microsoft Active Directory the MemberOf value is the DN of an entry that the current entry is a member in a Group and is referred to as a Forward Reference. (We use the term Virtual Attribute) Virtual Attribute. This implies You can not monitor the MemberOf attribute for changes (Like with DirXML)
Within Microsoft Active Directory MemberOf is flagged as "NO-USER-MODIFICATION" (or System-Only); This means you can NOT update the attribute. In order to add a user to a group you have to write the user's dn to the member attribute on the group object.