Web proxy client for outlook Express.

Hi,
 
I have an Isa server configured in integrated mode.  All the Internet access is 
done through the Webproxy client with IE 5.5 and IE6.0.  Now we some of our 
users want to use Outlook Express to read news and e-mails.  I thought ok, all 
I have to do is to configure is to configure the correct proxy server in 
Outlook express.  But I saw that Outlook express and IE are sharing the same 
Internet settings.
 
We I try to connect to my pop3 server; I have an error message (socket error 
10065).
 
Is it possible to make this configuration work or will I have to install the 
firewall client on every computer who must have a pop3/smtp access ?
 
I have also the same problem with a user who wants to use MSN Messenger.  
 
If someone has some more information ?
 
Thanks a lot,
 
Jean-Claude Cornely.

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