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Milestone 2 screenshots of an early Office 15 build leaked to the Internet on Monday.



From WinRumors:
The screenshots show a number of new features that Microsoft is working on for Office 15. Windows8italia posted the screenshots on Monday noting that they originate from Office 15 Milestone 2 build 15.0.2703.1000.
  Fresh Office 15 Milestone 2 screenshots reveal new features