Burak Gul of Eskisehir, Turkey, has the solution. To say ‘No to All’, simply hold down Shift as you click No. Windows will move or copy all files except those with duplicate names in the target folder. Note that if you move or copy folders as well as files, you still get at least one prompt for folders and another for files when duplicate names are found.
Ed ecco dov’era il tasto “No to All”.