Pity the poor Microsoft employees in charge of protecting Windows from third-party apps with security holes. The only code they can fix is Microsoft's. But as John Markoff reports this morning, Microsoft's boldest move to protect Windows Vista users totally backfired:

Microsoft has tried to combat the problem by building a variety of safeguards into its operating systems and its Internet Explorer browser, with mixed success. The User Account Control feature of Windows Vista, which popped up an endless stream of warnings that irritated users, proved to be one of the key factors in the poor reception for Vista. Last week in Los Angeles, the company said it had entirely reworked the user interface of its new Windows 7 operating system to minimize user frustration.