Botnets are networks of compromised computers, controlled by remote attackers in order to perform such illicit tasks as sending spam or attacking other computers.
Botnets

Botnets should be of concern to governments and businesses because of their ability to harness large numbers of individual computers to direct an attack against information technology infrastructure.
Microsoft is taking an aggressive approach to fighting botnets by collaborating with governments and others to take them down. Microsoft is also providing businesses, governments, and consumers with security tools and guidance.
Working towards this goal, Microsoft has released a document titled ‘Botnets: Guidance for Governments ‘ which can be downloaded at Microsoft.
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