 BOSTON NEW YORK--BUSINESS WIRE--State Street Corporation NYSE: STT and Brown Brothers Harriman Co. BBH today announced that they have entered into a definitive agreement for State Street to acquire BBHs Investor Services business, including its custody, accounting, fund administration, global markets and technology services, for 3.5 billion in cash. Following the transaction, BBH will continue to independently own and operate its separate Private Banking and Investment Managemen 