Sophos tested each piece of malware in the top ten on the operating system that was released yesterday, to establish whether users running Vista without any third-party security software would avoid infection.

The results showed that while the Windows Mail email client (Vista's upgrade of Outlook) could identify and halt all of the threats, Stratio-Zip, Netsky-D and MyDoom-O - each of which are commonly disseminated via email - were able to bypass the defences when accessed via a third-party web email client.

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