Microsoft's Internet Information Services (IIS) Web servers are more than twice as likely to deliver malware to unsuspecting users than the open source Apache Web server, according to a recent security survey performed by Internet search giant Google. That's quite an allegation, coming as it does from one of Microsoft's chief competitors.

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According to the survey, Microsoft IIS pops up twice as often--49 percent vs. 23 percent--as a malware distributing server than does Apache. This comes despite the fact that Apache appears to be in use on far more servers worldwide than does IIS. The majority of that malware appears to originate from China and South Korea, according to Google. (Curiously, most malware coming out of Germany is actually sent via Apache, not IIS.)