Microsoft freed at least 2 million PCs infected with a virus

Microsoft and the FBI, aided by authorities in more than 80 countries, on June 5 sought to take down 1,400 malicious computer networks known as the Citadel Botnets by severing their access to infected machines. Microsoft's Digital Crimes Unit is working with its partners overseas to determine exactly how many of the Citadel botnets are still operational.

Source: http://www.reuters.com/article/2013/06/18/net-us-citadel-botnet-idUSBRE95H1EG20130618

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