Windows 7: Microsoft Takes Down the Waledac Botnet.

Microsoft has taken down one of the 10 largest botnets in the United States and a major source of spam globally. Tim Cranton, Microsoft associate general counsel, made public the results of the initiative referred to internally as Operation b49 on February 24th, after the company made sure that the actions it has taken against the Waledac botnet were successful. In order to take down Waledac, the Redmond giant used a combination of legal action and a technical counterattack.