Introduced in September 2009, Microsoft Security Essentials (MSE) replaced Microsoft's antivirus subscription service (see Windows Live OneCare) and its Defender antispyware software (see ...

As you can see from the above points, pricing and performance impact are the biggest negatives of using some common ...

Microsoft Security Essentials 4.0 does a decent job protecting a clean PC, but in testing its cleanup of already-infested systems wasn't thorough. You can get better protection for the same price.