David Berlind:  With Microsoft poised to transform Windows XP's built-in personal firewall into a more serious security technology, now's a good time for enterprises to think more strategically before buying any more third-party personal firewall technology. And remaining independent personal firewall vendors like ZoneLabs ought to consider their long-term survival strategies. It won't be the first time that Microsoft's decision to can some added functionality into Windows has sounded the death knell for a cottage industry. But where's the outbound filtering?