NEW YORK (Standard&Poor's) March 8, 2007--Standard&Poor's Ratings Services said today that it revised the CreditWatch implications on CVS Corp.'s long-term ratings, including the 'BBB+' corporate credit rating, to negative from developing. The ratings were initially placed on CreditWatch on Nov. 2, 2006, when Woonsocket, R.I.-based CVS announced a definitive agreement to merge with Caremark Rx Inc. (BBB/Stable/--). The 'A-2' short-term and CP ratings on CVS are not on CreditWatch. The revision of the CreditWatch listing follows CVS' and Caremark's fourth proposal for the structure of their proposed merger. Under the prior deal structure, Standard&Poor's would most likely have affirmed the ratings. "We continue to believe that a successful merger between CVS and Caremark would