A view is a set of filter rules. Using views, you may quickly filter out messages that you don't want to see, for example read mail. Filtered messages are only hidden, you may display them at any time by switching view or disabling it. You may define up to ten views, each accessible with a hotkey from Alt+1 to Alt+0. Additionally, using Ctrl+Alt+<number> you may create/edit that view. You may also use View menu to switch views and configure them. View also stores information about sorting order and threads view mode, and can be configured using Filtering submenu) - changes take place immediately.
Click here, to find out more about view editor.