Jean-Pierre Paradis's Blog: Microsoft changes default Flash behavior in Windows 8 and RT

In a surprise reversal, Microsoft has changed the default behavior of Flash content on websites viewed using Internet Explorer in Windows 8 or Windows RT. Previously, sites had to be on a whitelist before Flash would work. The new behavior effectively turns the Compatibility View list into an exclusive blacklist of badly behaved sites.

Source : The Ed Bott Report | ZDNet