c# and ISA Server 2006 forms based authentication

Question

Hi.

I am trying to access Exchange 20007 web services through a c# application, basically to read mail in a mailbox. My hurdle is I need to authenticate with an SSL ISA 2006 forms based authentication first and use the cookie to query the exchange mailbox. Has anyone had any experience with this, all the examples I have found use integrated or forms based directly to exchange and I have not been able to find an example that uses ISA 2006 forms based authentication? I also need this for Sharepoint 2007 that uses form based authentication with ISA 2006 to read data from a web site.

Many thanks
Derrick