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Microsoft's Metro design language is at the heart of Office 2013, from PowerPoint templates to the chromeless user interface that focuses on your content rather than the menus and buttons around it.
Touch mode for Outlook adds a new set of icons to the far right of the screen — where you can quickly tap to select the most common functions for a message, from replying to deleting to filing a message.
Outlook 2013's new Peek feature lets you quickly check your calendar by rolling a mouse over the menu bar. You can then see your appointments, and make appropriate decisions without leaving a message.