OWA Authentication

Hello everyone,

Our network is set up in two domains. Our mail server is in domain "A". Domain "B" is where everything else lies. When a user logs in they login to domain "B" and they can access their email that is in domain "A". However, the users don't know their password for domain "A". We have had Outlook Web Access in place for a while now and the only people who use it are those that know their domain "A" password (which is almost no one). What we would like to have happen is that users can use their same username and password that they use in domain "B" to gain access to OWA.