On the Xfce 12.10 desktop drag&drop to move files into a folder would copy them instead of moving (cut/paste) them.
I tend to have many files on the desktop and usually I grab them and put them in a folder for further use etc. I want to be able to do this by drag&drop, but at the present drag&drop makes a duplicate of them in that folder without removing them from their previous location.
In Xfce I use the default Thunar, and it handles the desktop.
UPDATE:
The question is limited to an older version of Thunar. In thunar 1.6.3, Xubuntu 14.04. drag&drop moves by default instead of just copy.
Best Answer
I hope that this is what you want.
Well in Thunar , highlight all the files that you want to move, drag them with the right mouse button, and that will give you a pop up menu, that gives you the option to Move
Also you can use the Shift, while dragging the files, and that will also move them.