I think you will find what you are looking for at the following site:
In the first search field, enter "proxy server", and follow the first link
you see presented to go to the article. It's not all that negative, but
points out that more security may be required.
I plan to use PSINet' managed and monitored "RouteWaller" packet filtering
firewall router in front of MS Proxy Server running by itself on NT Server
4.0. Any thoughts on this arrangement, Jim?
Microsoft has some interesting testimonials on their Proxy Server area.
One of the sources is a newspaper group right here in my town. I spoke to
him, and he is very pleased; using PS ONLY!