A family of Microsoft word processing software products for creating web, email, and print documents.
Edit: The answer below was correct for the Office Technical Preview at the time it was written. In a later update of the Preview, the ability to reduce the spacing of the Quick Access Toolbar was removed, and it is still absent in the released version as of September 2015. Please visit http://office.uservoice.com/forums/285186-general/suggestions/9906966-office-2016-quick-access-toolbar-too-wide and vote to have the Mouse Mode spacing of the Quick Access Toolbar restored.
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The Office 2013 / Office 365 programs have a touch mode with wider spacing, and a mouse mode with the same spacing as previous versions. (This affects both the Quick Access Toolbar and the ribbon.)
Click the down-arrow at the right end of the Quick Access Toolbar and click the item "Touch/Mouse Mode". The button that appears shows a hand with the index finger extended and touching a blue spot. Click that button and choose the mouse mode.