Mail and Preview app in OS X Lion default to display icons only for the toolbar. Some of the icons are new and you might not know what they do.
The above shows the default toolbar for Mail app (top) and Preview app (bottom). You can customize the toolbar to display labels if you find the buttons not so obvious in meaning:
- Select from the menu View>Customize Toolbar…
- At the left bottom corner of the customize toolbar sheet, change “Show Icon Only” to “Show Icon and Text”.
- Click the “Done” button at right bottom corner to close the customize toolbar sheet.
That’s all that is required to display informational text explaining the buttons on the toolbar. The following shows the toolbar with both icon and text for Mail app (top) and Preview app (bottom):
You can always go back to View>Customize Toolbar… and change back to the default “Show Icon Only”.