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However, if the code is not recognized, Internet Explorer will accept it anyway and allow the requester full access to the user for third-party cookie purposes. Google didn’t do this “in a manner consistent with the technology,” Microsoft suggests, as it used the following message:
“P3P: CP="This is not a P3P policy! See http://www.google.com/support/accounts/bin/answer.py?hl=en&answer=151657 for more info."
Microsoft described being able to bypass its browser’s privacy settings in this way as “a nuance in the P3P specification,” but as was pointed out by El Reg last year and in academic papers in 2010, it’s a tactic that’s been widely used to circumvent the privacy wishes of the browser user. Microsoft is one of a dwindling band of companies still using P3P, and this latest admission will increase the decay in support.