The Quick Access Toolbar is a Microsoft Office 2007 feature, not specific to Outlook. Other Office programs depend largely on the ribbon instead of toolbars with the exception of Quick Access Toolbar. The toolbar appears next to the Microsoft Office button in the upper-left corner.
It also appears above or below the ribbon in other Microsoft Office programs. The Quick Access Toolbar in Microsoft Word appears above the ribbon.
You can move the Quick Access Toolbar below the ribbon.
Click the Customize Quick Access Toolbar button to view its menu. It provides a list of commonly used commands for quick access.
Click "More Commands," if you wish to add or remove commands from the Quick Access Toolbar.
To view other commands, click "Popular Commands" for a list.
The options on the left from Popular to Advanced contain the default and current settings for Microsoft Office programs. Click Advanced for a list of Outlook options. Tweak them to your preferences.