By preparing this ham at the beginning of the month, you'll have enough left over to use in two casserole recipes and two sandwich recipes.
Combine first 6 ingredients. Score fat on ham in a diamond pattern. Sprinkle ham with sugar mixture, and place in a lightly greased shallow roasting pan. Pour cola into pan.
Bake, covered, at 325° for 1 hour. Uncover and bake 15 more minutes.
Stir together preserves and orange juice. Spoon 3/4 cup glaze over ham, and bake 15 more minutes or until a meat thermometer inserted into thickest portion registers 140°. Let stand 15 minutes before slicing. Serve with remaining glaze.