Bring a large pot of lightly salted water to a boil. Add the macaroni and cook until tender, about 8 minutes. Rinse under cold water and drain.
In a large bowl, mix together the mayonnaise, vinegar, sugar, mustard, salt and pepper. Stir in the onion, celery, green pepper, carrot, pimentos and macaroni. Refrigerate for at least 4 hours before serving, but preferably overnight.
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