The custom group interface implements all group features with the addition of the ability to rename the groupNamespace: UCCollaborationLib
Assembly: Microsoft.Office.Uc (in Microsoft.Office.Uc.dll)
Unlike other group types, the custom group can be deleted from the local user's group collection as well as created by the user. The user is responsible for maintaining the contact membership of the custom group. The interface identifier (IID) of this interface is d804ba85-db0f-49ee-b723-dcdf0425bd9f.