title: SharePoint: Someone leaves the organization but must remain in list
body: <p>We have a list of people.  In that list is a "Person or Group" column that validates the person against Active Directory (AD).  Since someone recently left our organization he is now inactive in AD.  As a result when maintaining his SharePoint list record, his name no longer validates and in order to save the record we have to remove his AD username.  We now have a record which is no longer tied to the person.</p>
  
  <p>Sure.  We could create the name field as basic text, but management doesn't like that entering text is not aided by AD validation.</p>
  
  <p>Is there a way of getting the best of both worlds?  </p>
  
  <p>We don't want AD forcing us to detach former employee user accounts from our SharePoint lists since those employee records serve historic purposes.</p>