A new e-mail virus gained a greater foothold in unpatched Windows PCs on Tuesday, spurring antivirus companies to upgrade their estimate of the virus' danger. Known as W32.Bugbear or I-Worm.Tanatos, the mass-mailing computer virus started infecting computers via e-mail on Sunday. On Tuesday, it accounted for nearly 11,000 infected e-mail messages intercepted by e-mail service provider MessageLabs' gateway servers. That placed it second to Klez.h, which accounted for about 14,000 e-mail messages.
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