Passport, however, has raised concerns among privacy groups. Groups such as the US-based Electronic Privacy Information Centre have complained publicly that Passport gives Microsoft the ability to track and monitor Internet use.
Microsoft has denied that Passport represents any violation of privacy.
"Microsoft has basically placed itself in the role of being the guardian of end-user information," says EPIC's executive director, Marc Rotenberg. "We have questions if Microsoft is fairly representing what the risks of that could be."
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