Hi, i hope that this will not be cosiderated O/T...

I have several clients using Outlook Express 6 with HTTPMail protocol (they access to the mail using outlook express through port 80). We've implemented here an ISA proxy with authentication. The thing is that Outlook Express doesn't know authenticate to an ISA Server (i still can't understand how MS guys didn't think about that...)

I found this link but it doesn't apply to our trouble because we have the ISA Proxy in "cache mode" and we can't use Security client.

So, the question is, some of you guys have the same problem? And, of course, do you have some solution?
The only I found is create a tunnel with this . It's very interesting and it works, but i'm looking for a solution that not requires installation in the client side.

Thank you in advance!