In order to pass Virus Bulletin's test, the submitted products were required to detect all malware known to be "In the Wild" via both on-demand and on-access, without reporting any false positives. They were bombarded with some 3,000 unique samples of four malware types: WildList viruses, worms and bots, polymorphic viruses, and Trojans.
Although Avira and Sophos' products failed Virus Bulletin's test, they only missed one malware sample out of the thousands faced -- in order to receive a VB100 award, applications must detect 100%. That said, Avira told Ars Technica that the issue was sorted before VB's results were published.
Fail: AhnLab V3Net (171 wildlist misses), Authentium Command (159 wildlist misses), Avira AntiVir Server (1 wildlist miss), Filseclab Twister (5655 wildlist misses, 1 false positive), Fortinet FortiClient (38 wildlist misses), Frisk F-PROT (159 wildlist misses), Ikarus virus.utilities (3759 wildlist misses, 4 false positives), Kingsoft I.S. 2009 Advanced (98 wildlist misses), Kingsoft I.S. 2009 Standard (2461 wildlist misses), Sophos Anti-Virus (1 wildlist miss), and VirusBuster for Servers (5 wildlist misses).