Question : Publishing Exchange 2007 OWA using NTLM with Forefront TMG?

Is there any benefit to making a separate rule for OWA in TMG so that NTLM can be used for authentication from the TMG server to the CAS?  This article suggests it when using ISA 2006, but I haven't been able to tell any difference and security shouldn't be an issue since we use SSL: http://www.isaserver.org/tutorials/Publishing-Exchange-2007-OWA-Exchange-ActiveSync-RPCHTTP-2006-ISA-Firewall-Part6.html

Answer : Publishing Exchange 2007 OWA using NTLM with Forefront TMG?

I'm just rereading the following MS articles.  I think it's making more sense to me now.

http://technet.microsoft.com/en-us/library/bb794751.aspx#AppendixD
http://technet.microsoft.com/en-us/library/bb232199(EXCHG.80).aspx