STIR boiling water into dry gelatin in large bowl 2 minutes until completely dissolved. Add enough ice to cold water to measure 1 cup. Add to gelatin; stir until slightly thickened. Remove any unmelted ice.
ADD whipped topping and orange zest; beat with wire whisk until well blended. Gently stir in cranberry sauce. Refrigerate 20 to 30 minutes or until mixture is very thick and will mound. Spoon into crust.
REFRIGERATE 4 hours or until firm. Store leftover pie in refrigerator.