Microsoft challenges results

Microsoft has reacted to reports that its antimalware software was not performing ‘too well’ in the tests performed by, is an independent IT Security organization, which conducts antivirus software tests regularly every month. According to it, Microsoft’s antimalware software failed to win the AV-Test certificate for the 2nd consecutive month due to poor performance.


Microsoft in a blog post has said:

Our review showed that 0.0033 percent of our Microsoft Security Essentials and Microsoft Forefront Endpoint Protection customers were impacted by malware samples not detected during the test. In addition, 94 percent of the malware samples not detected during the test didn’t impact our customers.

Microsoft spelled out some keys points which need to be noted about the test:

  1. AV-Test reports on samples hit/missed by category. Microsoft reports based on customer impact.
  2. AV-Test’s test results indicate that our products detected 72% of all “0-day malware” using a sample size of 100 pieces of malware. Microsoft learns from telemetry from hundreds of millions of systems around the world that 99.997 percent of its customers hit with any 0-day did not encounter the malware samples tested in this test.
  3. AV-Test’s test results indicate that our products missed 9 percent of “recent malware” using a sample size of 216,000 pieces of malware. Microsoft learns from telemetry that 94 percent of these missed malware samples were never encountered by any of its customers.

Microsoft added that it is difficult for independent antimalware testing organizations to devise tests that are consistent with the real-world conditions. In fact, AV-Test too had acknowledged this fact and shared some of the difficulties & shortfalls in many of the independent industry tests in a presentation they gave at the AVAR Security Conference in 2012.

Nevertheless, Microsoft has acknowledged the importance that customers give to Industry testing feedback, and is committed to reducing its 0.0033% margin to zero.

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Anand Khanse is the Admin of, a 10-year Microsoft MVP Awardee in Windows (2006-16) & a Windows Insider MVP. He enjoys following and reporting Microsoft news and developments in the world of Personal Computing & Social Media.


  1. JoeBtfsplk

    I’ve been recommending MSE and installing it on customer machines for quite some time now. None have reported problems. Many who had commercial A/V suites have commented positively on the speed boost they’ve experienced. Microsoft hit a home run with this software.

  2. Dave Morrison

    I’m not sure why everyone raves about MSE…. I’ve done my own testing for a while now and MSE has let a few malware/spyware into my computer that others do not. I have never been a Hugh fan of MSE anyway …

  3. Edward Gudz

    You know, even IF they used malware and viruses in the test that most will never encounter in the wild, shouldn’t the product STILL detect it? This is where the problem is, yet again Microsoft giving you a product and determining on it’s own how best you need to use.. Take it from me folks, MSE DOES NOT catch everything that comes through your system, it does and WILL let things through WITHOUT your knowedege, it has happened to me, this is why I DO NOT use MSE.

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