HONG KONG--(BUSINESS WIRE)--A.M. Best has commented that the financial strength rating of A+ (Superior) and the issuer credit rating of “aa” of Mitsui Sumitomo Insurance Company Limited (MSI) (Japan), a wholly owned subsidiary of MS&AD Insurance Group Holdings, Inc., are unchanged following the announcement that MSI has reached an agreement with Amlin Plc. (Amlin) (United Kingdom) (LSE:AML) to commence the procedure to acquire 100% of the shares of Amlin. The total transaction consideration