When publishing Exchange 2007 with multiple web sites (under IIS) you may end up with the external published URL doesn’t authenticate well. In my case I had ISA 2006 publishing the Exchange 2007 SP1, and suddenly the OWA stopped working and I got the URL https://mail.domain.com/owa/auth/owaauth.dll and the error message was (as usual) totaly unusable saying … تابع قراءة Exchange 2007 OWA Error