Jack Ma took to an internal Alibaba forum to voice his support for a company undergoing a turbulent restructuring, emerging from seclusion for the second time in months to try and shore up sagging morale at the Chinese e-commerce pioneer he co-created. The billionaire, who had retreated from the public spotlight in recent years, penned a lengthy memo in which he blessed efforts by new leaders Joseph Tsai and Eddie Wu to revive a stalled company. He said Alibaba Group Holding Ltd. is now on th...