troubleshooting Question

OWA prompts for password some users and some not

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olchs asked on
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I work in a school. Recently setup Exchange 2003. Both staff and students use OWA . The enabled authentications settings are: Basic Authentication  and Integrated Windows Authentication.
What I want achieve for all users is to access OWA without  having to enter a username and password  (when accessing it from within the domain), which is what I thought the Integrated Windows Authentication does.
The problem I have at the moment is that students are prompted to enter a username and password  while staff are not.
a) Why does OWA differentiate between students and staff and how?
b) How do I get exchange to not prompt students  for password ?
c) Obvously students and staff have differnt GPs. Could that be the reason ? If yes what would be GP the setting that causes this?
Thanks in advance
Christos
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