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I won't try Kerio 2.1.5 anyway. Just listen what beast99 said: it will be outdated soon.
I’m not trying to say you should try it and I’m not recommending any firewall at all here. What I will say though is that the way the firewalls work mean a lot. Firewalls that rely on IDS or Application rules can generally be more prone to becoming out dated. But if you are talking about strict port blocking. That doesn’t change a whole lot no matter what the exploit. As long as the firewall has the ability to control the ports on a given OS it is capable of doing its job. It all becomes a different story when you move to a newer version of windows, but this is not like an antivirus or spyware detection. If an application can block traffic on port 135 in windows xp today it can do it 5 years from now. When you start talking about detecting bad traffic is where you start opening a new bag of worms.
Point being for me looking at firewalls I like to find out what options they hide from me for simplicity. But again this is not me trying to advocate any firewall, but me simply saying that straight firewalls don’t become dated as fast as things the rely on scanning or detecting. So believe or dis-believe its my 2 cents.