text: If you select User ID to be case-sensitive, a user must type the user ID exactly as it was 
  entered when the user was added. For example, if you add the user ID LaGuarde, the user 
  must enter LaGuarde to log on to the server. 
  
  If you set a password as case-sensitive, a user must enter the password exactly as it was 
  entered when the user was added. 