Squid with Web Folders

Hi all,

I am running Squid 2.2Stable3 (yes, I will upgrade it at some point :-).
We wish to block all external internet access except through the proxy
server, but unfortunately this cannot be done as Web Folders (M$) do not run
through Squid. I believe they use NTLM, which would explain the problem.
Does anyone know if there is a work-around for this?

Cheers,
Matt.

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Matt Hunter