In a recent test carried out by Virus Bulletin, Microsoft's own antivirus software, Live OneCare, was one of four packages which failed. The test involved 15 antivirus packages designed for businesses using Windows Vista, all of which were released about two months ago. To pass the test, each package had to detect a set of viruses that are known to be circulating without giving any false positives. However, Live OneCare 1.5, McAfee VirusScan Enterprise 8.1i, G DATA AntiVirusKit 2007 and Norman VirusControl 5.90 all failed. Other software, including that from Computer Associates, Fortinet, F-Secure, Kaspersky, Sophus and Symantec, passed without problems. McAfee claims that the test did not use its latest update, whilst Microsoft has pledged to improve its software.