If you really want to dig to the sources of the idea, Microsoft had it back in 2006 for Office 2007 Beta2. http://blogs.msdn.com/b/jensenh/archive/2006/05/26/60

If you really want to dig to the sources of the idea, Microsoft had it back in 2006 for Office 2007 Beta2. http://blogs.msdn.com/b/jensenh/archive/2006/05/26/607768.aspx http://blogs.msdn.com/b/jensenh/archive/2006/05/26/607768.as...