I used to drag email to subfolder(s) I created and they would move. With 7, it seems they copy to the subfolder, but remain in the original folder as well. Is there a setting somewhere I can change this?

I used to drag email to subfolder(s) I created and they would move. With 7, it seems they copy to the subfolder, but remain in the original folder as well. Is there a setting somewhere I can change this?