The campaign reveals just how much of a threat to Microsoft's bottom line security flaws now represent.

When the Blaster worm hobbled hundreds of thousands of computers around the world in August — only the latest plague to exploit a flaw in Windows operating systems — it also hurt Microsoft's ability to book new contracts with corporate customers.

For the first time, it seemed, flaws in Microsoft's software were translating into flaws in the company's business model.

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