Microsoft is rumored to be integrating the controversial "Ribbon" interface that it pioneered in it's Office 2007 product in Windows 8. The screenshots of a pre-beta version of Windows 8, if accurate, are an indication that this is in fact the case.
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Microsoft's decision to go "Ribbon" in Office were very controversial, but have been accepted by most users in the interim, albeit begrudgingly. It will be interesting to see users reaction when Windows 8 beta is distributed. I reckon you may hear a lot of moaning...