An outbox stores pending actions to be sent at a later time. You can change how many actions are performed or the delay interval for an outbox in your account behaviors.
Click on one of the following folders in the left sidebar
Selecting one of these will display the appropriate items in the main window. This is your queue.
This queue is set according to the settings you choose for your account behaviors.
The main window displays the user(s) the friend request, wall post, or message will be sent to and how many attempts have been made to send the friend request, wall post, or message.