It was not toggle-able. You could only opt out of an ill-defined subset of an ill defined set of collected data, including, but not limited to all user inputs performed on that system. You would know as much if you had read the material published by MS on this. Only with the recent update do they offer a tool with which to inspect at least part of the actual data sent to MS. There is however no proof that the data shown in that tool is complete (even though I believe that they truely intend to show everything - despite their traditionally pushy methods, they are not Facebook).