Coldfusion and Exchange 2010 CAS

I have a windows 2008 R2 server. I have the default web site with exchange 2010 client access server installed. When I install cold fusion 9 it breaks outlook web access. If I remove coldfusion it works fine again. If I put in the old applicationhost.config file owa will work again but not coldfusion. After coldfusion I get owa/&reason=0. I tried installing coldfusion first but get the same results. Any ideas?