Project Owners need a way to mark a person on a project as inactive, so that people who were on a project previously, but no longer an active participant, do not get notifications when the status changes. The Project Owner still wants to share the project with an inactive person, but doesn't want to have notifications go to those who are no longer active on the project. A project can be shared with hundreds of people, but only those currently active on the project should get notifications of status changes. Removing people from a project causes a loss of historical participation information on the project, so the Project Owner can no longer look to see who was on the project with a specific role (i.e. who used to be a Training Manager on the project).
