Preheat oven to 400 degrees F.In a medium mixing bowl, mix together cream cheese, mayo and sour cream until smooth. Add Ranch mix, salt, pepper and mix in well.Add artichokes and spinach and stir in well.Spread the dip mixture in an oven-safe dish. Sprinkle with mozzarella cheese.Bake for 10 to 12 minutes OR until the dip bubbles up on the edges and the cheese is melted.Cool to room temperature before serving.If you have leftovers, store in a container with lid in your fridge for up to 2 days.