On this sprawling corporate campus that is the heartland of personal computing, 9,000 elite Microsoft (news/quote) employees have gone back to school. Stung by a chorus of critics who said that its software code was increasingly buggy and vulnerable to attack, Microsoft began sending its programmers to a special course in writing secure software. And it ordered them to stop creating new programs until they had painstakingly re-examined the millions of lines of Windows operating system software for potential vulnerabilities.
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