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"Federal and state regulators are concerned that Microsoft may be violating the terms of its antitrust agreement with the "Shop for Music Online" feature of Windows XP, and have filed a court briefing regarding the issue. According to a CNET article, the "Shop for Music Online" feature raises concerns because it launches Internet Explorer and not the users chosen default browser. Microsoft has responded that it believes the feature falls within guidelines. The issue may be resolved by the courts if Microsoft and regulators are unable to reach an agreement." - Spymac