Trim fat and rind from ham. Score outside of ham in a diamond pattern. Place ham on a rack coated with cooking spray, and place rack in a shallow roasting pan.
Combine 1/4 cup maple syrup, 2 tablespoons mustard, orange rind, and orange juice; stir well, and brush over ham. Bake at 425° for 5 minutes. Reduce oven temperature to 325°, and cook an additional 1 hour and 30 minutes or until thoroughly heated. Baste ham with maple syrup mixture every 30 minutes. Transfer ham to a platter, and let stand 15 minutes before slicing.
Combine remaining syrup, remaining mustard, and marmalade in a small saucepan. Cook over medium heat 3 minutes or until thoroughly heated, stirring constantly. Serve with ham.
Note: Reserve the (18-ounce) ham bone from the Maple-Glazed Ham With Maple-Mustard Sauce to use in the Spicy Ham-and-Bean Soup recipe.