Microsoft made this announcement on its blog post today stating, It said that the reasons for not enabling DNT is that based on World Wide Web Consortium (W3C) latest draft proposals which say that, Taking the above draft proposals in cogniance Microsoft wont enable DNT by default state in Windows Express Settings in future releases however it will provide users with clear cut information about how to enable it, should they want it enabled.  The blog also stated that the DNT would be disabled by default in PCs are set up for first time and in PCs which upgrade from old OS to the new Windows 10 OS or new browser.