Nice post from ISA Server Team explaining how to simplify URL using ISA 2004/2006 with Exchange Server 2007.
Recently I have seen a fair number of cases where ISA Administrators were trying to redirect connections made to the root OWA Web site to the /owa folder when publishing Exchange 2007 through ISA Server 2004/2006. In these particular cases they were using a documented trick for Exchange 2003 that involves entering a path on the OWA rule that looks like this /exchange\ . The trick is documented hereand works quite well for Exchange 2003. The problem is that people believe it should also work for Exchange 2007.