title: In active directory, what is mailNickname used for?
body: <p>In active directory, should mailNickname always equal samaccountname? Or, should it always be equal to the mail property (minus the "@domain")? </p>
  
  <p>My reason for asking is that we have recently changed everyone's primary email address to the first.last form and we set the mail property to the same. But, do we also need to modify the mailNickname property?</p>
  
  <p>Thanks</p>