For staff at, the departure of CEO Jeff Bezos may spell the end of one of the company's unusual and, for some managers, frightening practices: the "question mark" e-mail.

Bezos, whose e-mail address is public, receives customer complaints that he then forwards to the executive whose team is responsible for fixing the problem. Sometimes landing overnight, these e-mails from the world's second-richest person had no salutation, no commentary or thank you - just a single question mark...

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