I just discovered something interesting. The mouse was hovered over a message in the treeview list when Allie came in to ask something. My finger was on the mouse button at the time. I talked to her for a bit, finger still absentmindedly on the mouse button, and when I looked back I saw that the message title hyperlink had moved slightly, as in the start of a drag and drop operation. And in fact you can drag it around the screen. (Try it -- it's fun!) But the international no-can-do slash symbol hovered over it and I was unable to drop it anywhere.

Just interesting behavior, with maybe some feature potential down the road.....