UnumProvident probe UnumProvident Corp. confirmed that the Massachusetts Division of Insurance will investigate the insurance company's practices of paying bonuses and other forms of compensation to brokers in exchange for their customers' business. UnumProvident is one of 10 insurers whose subsidiaries will undergo so-called  quot;market exams quot; by state regulators, following New York Attorney General Eliot Spitzer's revelations of bid-rigging and price-fixing. The ...