3. The unified activity manager of claim 1 , wherein said placeholder management module comprises placeholder management logic programmed to manage placement of placeholders in any of said activity list view, activity view and persons and roles view in lieu of a specified collaborator, resource, or event.
3. The unified activity manager of claim 1 , wherein said placeholder management module comprises placeholder management logic programmed to manage placement of placeholders in any of said activity list view, activity view and persons and roles view in lieu of a specified collaborator, resource, or event. 4. The unified activity manager of claim 3 , wherein said placeholder management logic comprises additional programming to place visual indicia adjacent to a placeholder in any of said activity list view, said activity view and said persons and roles view.