The test set for Malware Protection Test consisted of about 38,000 samples. As we only use samples that have been analysed by our own in-house automated sandboxes, the quality of our sets is very high. Unlike some other testers, we only use malware in our tests, and do not include PUAs or other controversial software. What is malicious and what is “potentially unwanted” is sometimes debatable. We welcome feedback from vendors; however, the decision as to whether something can or cannot be classified as malware is ultimately up to us, even if our decisions may sometimes be regarded as imperfect.