Microsofts highly rated free antivirus “Security Essentials” has a new version which is available to the public as a beta as of November 29, 2011 .

From my testing and other reviews it seems the biggest improvement is in performance during scanning; it now uses even fewer resources than version 3.  Continued streamlining and simplification of the user interface is also a good thing.

Officially, Microsoft explains the following four items are of note in the new Beta:

“This Beta version of Microsoft Security Essentials includes the following new features and enhancements to better help protect your PC from threats:
• Enhanced protection through automatic malware remediation: The Beta program will clean highly impacting malware infections automatically, with no required user interaction.

• Enhanced performance: The Beta includes many performance improvements to make sure your PC performance isn’t compromised.

• Simplified UI – Simplified UI makes Microsoft Security Essentials Beta easier to use.

• New and improved protection engine: The updated engine offers enhanced detection with cleanup capabilities and better performance.”

Support is being handled through a public forum:


You may also find this video showing 20 “zero day” virus attacks on an MSE 4 machine  to be quite interesting


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