Secure Client Assess Role for Proxy Exchange 2007
This is only one solution that can be protect Exchange 2007 client access role.
For Outlook Anywhere Setting:
I only working with Basic Authentication.
Modify RpcwithCert setting in IIS
Using Basic Authentication Method for outlook anywhere
Outlook 2007 Exchange Proxy Setting
Outlook 2007 to Exchange 2007 connection setting
The following refer website:
How to proxying Exchange 2007 OWA, ActiveSync, Outlook Anywere using ISA 2006