We've got Exchange 2007 running on Server 2003 (I know...) and until last week it all worked fine and users of outlook and OWA worked fine. This week I've come back to a situation where outlook still works fine but web based access ONLY works if you set it to use basic authentication, not forms based. When using form based authentication there are no errors displayed, just the normal login form. On entering details and clicking login it just takes you back to the login form again. Eventvwr doesn't appear to show any errors. We'd like to continue with form based authentication. I've tried googling but nothing works so far...
Any suggestions as to what to try next would be appreciated.
Thanks