Microsoft Says 4.7 Million Infected PCs Freed

Microsoft Corp said it has freed at least 4.7 million infected personal computers from control of cyber crooks in its most successful digital crime-busting operation, which interrupted service at an Internet-services firm. The world's largest software maker has also identified at least another 4.7 million infected machines, though many are likely still controlled by cyber fraudsters, Microsoft's cybercrime-fighting Digital Crimes Unit said.