Is this true for you only or are others experiencing the same problem? Also, has this always been true or did this just start happening for you? One problem we saw with specific individuals was if their AD account was set to not inherit permissions they could not access OWA. This was true of users who were domain admins when we were running server 2000 and when we upgraded, their accounts were never set to inherit. Once we changed their accounts to inherit permissions they were able to access OWA.