Microsoft on Thursday sued two technical support companies, alleging that they infringed numerous Microsoft trademarks and practiced false advertising as they tricked consumers into paying for bogus help.

The lawsuit was the first time Microsoft turned to the courts to try to stem the flood of tech support scams that swamp Windows users.

“Defendants have utilized the Microsoft trademarks and service marks to enhance their credentials and confuse customers about their affiliation with Microsoft,” the complaint stated. “Defendants then use their enhanced credibility to convince consumers that their personal computers are infected with malware in order to sell them unnecessary technical support and security services to clean their computers.”

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