messaging tool in China. In October 2013, the Alibaba's chairman Jack Ma announced that the Alibaba Group would no longer use Tencent's messaging application WeChat, and would henceforth promote its own messaging application and service, Laiwang. In April 2014, Alibaba Group and UCWeb, a Chinese provider of mobile internet software technology and services, launched Shenma (神马), a mobile-only search engine, as part of a joint venture. Later in June, the Alibaba Group acquired UCWeb, with an international product portfolio that includes a mobile browsing service (UC Browser), app and game distribution platforms (9Apps and 9Game), a mobile traffic platform (UC Union) and UC News that primarily caters to all types of news in the India market (as an aggregator) among others. Alibaba's Y Projects Business Unit developed the Xuexi Qiangguo app, which is used to teach Xi Jinping Thought. In October 2005, Alibaba Group formed a strategic partnership with Yahoo! and acquired Yahoo! China, a Chinese portal previously launched on 24 September 1999 that focuses on Internet services like news, email, and search. In April 2013, Alibaba Group announced that, as part of the agreement to buy back the Yahoo! Mail stake, that they would suspend technological support for China Yahoo! Mail service and begin migration of Yahoo! China Mail accounts. Several options were offered to users to make the transition as smooth as possible, and Yahoo! China users had four months to migrate their accounts to the Aliyun mail service, the Yahoo! Mail service in the United States, or to another third-party e-mail provider of the user's choice. Yahoo! China closed its mail service on 19 August 2013. E-mails sent to Yahoo! China accounts could be forwarded to an Alimail box until 31 December 2014. Users were also allowed to transfer e-mail accounts to yahoo.com or any other e-mail service. It is estimated there are no more than a million users with Yahoo! Mail for China and chances are they also own other e-mail accounts. In 2014, Alibaba Group founded DingTalk, an enterprise communication and collaboration platform. Also known as Ding Ding, the app was developed as part of efforts to compete with rival Tencent's WeChat. DingTalk is managed by Alibaba's cloud computing division. Others In 2014, Alibaba and Yunfeng Capital, a private equity firm, launched AliHealth when the two companies bought a 54% stake in CITIC 21CN for HK$1.33 billion (US$171 million). It is listed on the Hong