In a move that has been highly anticipated or, depending on your point of view, highly dreaded, Moody’s Investors Service cut its credit rating on Sony Corp. by one notch, dropping it below investment grade – taking it to “junk” status, in industry parlance. The downgrade was made on Monday and it is significant in that it symbolizes the continuing struggles of the company as it to tries to improve its fortunes – so far with mixed results.