Thankfully, other free alternatives performed better: Avast (14 points) edged out AVG (12.5 points) and Avira (12 points), receiving above-average marks all-around. Meanwhile, Bitdefender topped payware offerings, netting an almost perfect score of 17 points.
If you're somehow not familiar with it, MSSE is Microsoft's nag-free, no-cost anti-virus solution for Windows XP, Vista and 7 owners. Although Windows 8 users can't install MSSE, the utility essentially comes integrated into the OS -- it's simply disguised as "Windows Defender".
AV-Test is an independent German organization who, amongst other things, rates anti-virus utilities based on various metrics about every two months. AV-Test's certification is by no means an industry requirement, but their test results have served as a standardized way to benchmark anti-virus programs for years.
Similarly, AV Comparatives is another firm who offers their own, indepedent anti-virus grading service. After recalling MSSE scoring very high marks with AV Comparatives back in 2009, I checked out the site's latest tests to get a second opinion. Curiously though, MSSE has been missing from tests at AV Comparatives since 2010. Looks like we'll have to take AV-Test's word on this one.