Bake ham in preheated oven, uncovered, for 1 1/2 to 2 hours, basting occasionally with its own juices. Remove from oven and spread top of ham with orange marmalade, then return to oven and bake another 30 minutes or until ham reaches 140 degrees inside when measured with a meat thermometer. Remove from oven and let res 10 minutes, then serve. Makes 12 to 16 servings. Enjoy!