Overview -- U.S.-based commercial information products company, The Dun & Bradstreet Corp. plans to issue between $500 million and $700 million senior unsecured notes across a five-year and 10-year maturity. -- The company will use proceeds from the proposed notes to refinance its existing $400 million notes due 2013, and to repay a portion of borrowings under its revolving credit facility. -- We are affirming our 'BBB+' corporate credit rating on the company. At the same tim