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As far as motivation goes, Microsoft sees its entry into the security fray as a "very broad opportunity" for itself and for its customers, Brown said. "The primary reason we're doing this is that there is clearly a customer need for this approach," he said. Companies such as McAfee, Symantec, Trend Micro and Computer Associates have long demonstrated that there is money to be made in protecting Windows systems. For Microsoft, it is simpler to create security add-ons than to build security into its products, an approach that would also make it harder for the company to make extra money.