The Do Not Track feature in a browser is supposed to send a signal to third-party Web sites, telling them not to track your Internet activity. Most browsers include this as an option that the user can turn on or off. Microsoft announced last week will have Do Not Track turned on by default in Microsoft IE 10. But that means it won’t be compliant with the official spec.
Which means that tech and ad companies who say they comply with Do Not Track could simply ignore the flag set by IE 10 and track those who use that browser, says Wired. Which means Microsoft has no choice but to change the setting.