Greg writes with this excerpt from Ars Techica: "Following a four-month beta program, Microsoft Security Essentials (MSE) 2.0 has been released. The new version significantly revamps the heuristic scanning engine, adds Windows Firewall integration as well as network traffic inspection. The update unquestionably makes MSE, which has already become very popular due to its quiet but effective ways, even more of a must-have for Windows users. MSE has always been very good at finding and removing malware, but it has relied mainly on antimalware definitions. The improved heuristic engine makes it even better at detecting threats; at the same time, we expect the number of false positives to slightly increase as well. The new Windows Firewall integration is a minor improvement: it lets you tweak Microsoft's firewall from inside MSE."