You can use your keyboard to select and view messages in your mailbox. In order to move between messages, use the and keys while holding the Ctrl key. You will start at the bottom of the page (last displayed message) if you press and at the top of the page (first displayed message) if you press .
The current message is highlighted just as if you were mousing over it. While you are moving up and down through the mailbox list, you can press Space to select or deselect that message, and you can press Enter to view that message.
If you are holding Alt instead of Ctrl while navigating through the mailbox, the messages you are passing are automatically selected or deselected.
Use the and keys on your keyboard to go to the previous page of messages in your mailbox or the next page of messages.