Sony shares post biggest daily gain in nine years after upgrading outlook

Sony Corp's shares surged on Thursday to post their biggest daily gain in nine years after the Japanese consumer electronics and entertainment group raised its full-year forecast to signal the worst of its troubles may be over. Backed by cost cuts and stronger sales of sensors and videogames, Sony on Wednesday trimmed its net loss forecast for the year through end-March and said it will post a full-year operating profit instead of a loss. This was Sony's first upgrade of a forecast sin