Check the selection box at the top of the message list and it will select everything on that page------I think 50. Then hit the Trashcan icon. Or, right-click on the folder, and you will see "Delete all messages" as a choice in the menu that pops up to empty the folder. You can also check one message, then hold down the Shift key and scroll down to the last one you want to get rid of. That will select everything in between. Then hit the Trashcan icon.