Setup OWA With ISA

Setup OWA with an ISA 2006 server

ISA 2006 has Exchange 2007 wizards to be able to publish OWA. ISA 2006 RTM did not include the option to handle SAN attributes within certificates, so make sure you are using ISA 2006 SP1 when publishing Exchange 2007.check out the new features in ISA 2006 SP1.

There a lot of guides and how-to when it comes to publishing Exchange 2007 & ISA 2006. but really all you need is these following links:

From the ForeFront TMG Team itself : Publishing Exchange Server 2007 with ISA Server 2006 & Troubleshooting OWA 2007 Publishing Rules on ISA Server 2006.

Also, A more detailed view of the configuration process can be found here at MSExchange.org or here at Microsoft.