Combine 1/2 cup water, chopped apricots, cranberries, and nectar in a medium saucepan. Bring to a boil; cook 2 minutes. Remove from heat, and let stand, covered, 20 minutes. Drain apricot mixture in a colander over a bowl, reserving apricot mixture and cooking liquid. Add rind, orange juice, and margarine to cooking liquid; set aside.
Combine the sweet potato and 1/4 cup water in a 3-quart casserole. Cover with casserole lid; microwave at high 18 minutes or until tender, stirring after 9 minutes. Drain well; set aside.
Preheat oven to 350°.
Arrange half of sweet potatoes in a 3-quart casserole coated with cooking spray; top with half of apricot mixture and 1/4 cup sugar. Repeat procedure with remaining sweet potato, apricot mixture, and 1/4 cup sugar. Pour reserved cooking liquid over sweet potato mixture. Bake, uncovered, at 350° for 30 minutes or until bubbly.