Kevin Bankston, an attorney and Internet privacy expert with the San Francisco-based Electronic Frontier Foundation, worries that this is potentially "a wholesale handing over of one's privacy to Microsoft. I would say, right now, definitely don't use this. If you're careful, you don't need this."
Users do have the option of turning the filter off, and Microsoft says that the company has no plans to retain information contained in those queries.
"We don't store that information," said Greg Sullivan, Microsoft Windows group product manager. "There is no server event log, no data base, no hosted event file."