I am having this problem with our Exchange server (it serves up OWA too) where users get confronted with the following error:
HTTP/1.1 New Session Failed
This only happens with normal users though. I as an exchange full admin get no problems logging in. Can someone help me troubleshoot this one?
BTW, I ran the VBS file that was associated with the DST update, which changed permissions for all of our users (among other things). I'm highly suspicious that this is what caused our problems.