Description 1
This attribute specifies the relative identifier (RID) for the primary group of the user. By default, this is the RID for the Domain Users group. The user is a member of its primary group, although the group is not listed in the user's memberOf attribute. Likewise, a group object's member attribute will not list the user objects whose primaryGroupID is set to the group. For more information, refer to [MS-SAMR] section 3.1.1.8.2, [MS-ADTS], and [MS-ADA2] sections 2.43 and 2.45.