Linux/Apache/Proxy help

[Curtis Myers <cmyers@xxxxxxxxxxxxxx>]

I have been running Linux as my desktop for about a year now and I am
ready to move a bit further.  We currently run NT4.0/IIS4.0 as our web
server with
Proxy2.0 so that our LAN users can browse the web, SSL/HTTPS is a
necessity for some of our applications.  We have an NT4.0 server running
Exchange5.5 for email that binds to the proxy so that it can
send/receive  Internet email for our domain.  The machine that runs our
proxy/web is very unstable.  I have been unable to find a fix for the
proxy software that allows it to stay up for more than 12-16 hours at a
time.  The machine has been reinstalled 4 times now and had the majority
of it's hardware swapped to no effect.  All the info I have found has
been quite useless and MS tech support is at a loss as to the cause,
their suggestion was Tweak UI and some form of script to reboot the
machine every 8 hours.  Unacceptable.

A quick search on FreshMeat came up with a plethora of proxy type apps
and utilities that sounded reasonable for our situation.  My question
is, anyone here
know of a well tested reliable solution for the above situation that
would allow me to slip a linux box in to my network rack?

Thanks in advance,

Curtis Myers
cmyers@barnesaero.com
Network Administrator
Barnes Aerospace Lansing Division