Exchange CAS and the DMZ

This is really just to promote this posting on the MS Exchange team blog, which highlights planning for Client Access Roles and why MS no longer supports the "front end" in the DMZ. I have had several customers that have configured Exchange 2003 and prior with their CAS in their DMZ, and while it makes for an overcomplicated firewall configuration it is supported, however, support for this ended with Exchange 2003, and Microsoft finally wrote up some very good talking points on why this is no longer supported in Exchange 2007 and 2010.