lucy24 - 7:23 am on May 15, 2013 (gmt 0)
If the site uses piwik, you will be tracked when you use MSIE10. I can say that for 100% because I looked it up earlier today. A pair of from-the-horse's-mouth links are next door [webmasterworld.com] ;)
I've yet to find an explanation of what the ### Apache is supposed to do about the header, though-- short of outright not logging visits, which would cross the line from protecting privacy to falsifying information.