Place potatoes, covered, in a 2-quart casserole dish; microwave at HIGH for 10 minutes or until tender. Combine sugar, margarine, orange juice, and salt in a 2-cup glass measure. Microwave at HIGH 3 minutes, stirring every minute. Add sugar mixture and cranberry sauce to potatoes; toss gently. Microwave at HIGH 10 minutes or until heated through, basting with sauce twice during cooking. Garnish with orange rind, if desired.