This brings down a menu of many options you can use. On the right hand side of all menus are the appropriate keyboard commands that will complete the operation without using the drop down menu system. Try it inside message index lists, on toolbar buttons, and inside address fields. Alternately, double click on any single message to open it. The Out Box shows all messages sent with status symbols.
Unsent messages have a mailbox icon.
Sent messages switch to an envelope icon. Resending from the viewer screen provides an optional chance to modify the message first. Click on the Folders tab, then RMB click on an empty space on the Folders window to pop up the Folders menu. I suggest you skip the next portion of this file and come back to it later if necessary. It is not required reading before you can get up and running.