That's where the free VistaFirewallControl comes in. And as a practical matter, it's impossible to manually configure it to block malware making outbound connections. Unfortunately, the outbound filter in Windows Vista is, in essence, turned off by default.
Some malware can also turn your PC into a spam-spewing robot, sending out email without your knowledge. Outbound filters are important, because if you've been infected with a Trojan or similar software, it makes an outbound connection without your knowledge, letting someone else take control of your PC. Microsoft has been touting the new Windows Firewall in Windows Vista, which it says for the first time includes an outbound filter as well as an inbound filter. If you want true outbound firewall protection, use this to help manage Windows Vista's built-in firewall.
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