The Navigation Pane lists your folders. You can resize the Navigation Pane width by dragging the vertical divider to the left or right.
The Navigation Pane Toolbar allows you to access your Address Book, view your Web Calendar, Compose a new message, and apply Folder Actions.
You can also easily move messages and folders by using the drag and drop feature.
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To drag-and-drop:
Note: The message or folder will change to a green check mark when dropping the item into a valid location. Otherwise you will see a red null symbol.
Valid location marker
Invalid location marker