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Why Microsoft is a national security threat
(www.theregister.com)
This is a most excellent place for technology news and articles.
I always found it to be a real PITA... It felt like a parallel system to file permissions, which meant I had two things to configure instead of one and I never really saw the purpose. It seemed like it could be more granular than the default, but if it did anything more than that I never learned about it
Granted, I'm a dev, not an admin. I go back and configure the firewall after I shut it off because it was in my way... Eventually