The test requires security products to detected 100 per cent of the threats in a sample, which uses a collection of all known malware samples found to be currently in use by attackers.
After passing in June of last year, OneCare failed the test in February, when it caught 99.91 per cent of the threats.
Fallout from the news, combined with lackluster results in a test by AV Comparatives caused Microsoft to vow to users to that it would bring the security application up to snuff.
Microsoft is also touting passing grades that OneCare received from West Coast Labs and ICSA Labs. The next AV Comparatives test is scheduled for August of this year.
"These accolades are a strong endorsement of OneCare’s powerful anti-malware tools and mean that OneCare protects customers from known threats on the market today," OneCare lead product manager Gina Narkunas declared in a posting to a company blog.
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