We have been having issues today with our OWA page. at first it wasn't redirecting correctly. and now when I try to access our owa the page will load, but when I go to login I can see at the bottom it is trying to process owaauth.dll and it just hangs at this position.
http://forums.iis.net/t/1158191.aspx
http://social.technet.microsoft.com/Forums/en-US/exchangesvrclients/thread/0b9d2ed2-b27b-41bc-8428-36f9957d89fe