Is Sony Really Back?

Investors seem to think so, but big questions remain.

The company can't rely only on gamers.

Photographer: Johannes Eisele/AFP/Getty Images

The exact moment of any corporate turnaround is almost impossible to pinpoint. But if Sony's latest numbers truly do signal the revival of the Japanese icon -- the company just posted its best quarterly profit in seven years -- then the transformation may have begun last April, when Kenichiro Yoshida was promoted to chief financial officer.

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