This version of Microsoft Security Essentials includes the following new features and enhancements to better help protect your computer from threats:
-Windows Firewall integration. Security Essentials setup enables you to turn on or off Windows Firewall.
-Network Inspection System. This feature enhances real-time protection by inspecting network traffic to help proactively block exploitation of known network-based vulnerabilities.
-New and improved protection engine. The updated engine offers enhanced detection and cleanup capabilities with better performance.
*edit in response to comment #1
Sublym3. I manually updated my machines. This pic should answer the rest of your questions:
