Microsoft Corp has partnered Lenovo Group Ltd and Tencent Holdings Ltd to provide software security services for Windows XP users in China, after the U.S. tech firm stopped updating the operating system. Microsoft wants users to move to later, more secure versions of Windows and so stopped servicing the 13-year-old XP this week, potentially leaving users vulnerable to viruses and hacking. XP has 200 million users in China, or 70 percent of the market, according to Zhongguancun Online, cited by state news agency Xinhua. To continue support for XP users, Microsoft has partnered Lenovo, Tencent and several other Chinese computing companies to offer services such as information protection, post-virus repairs and upgrades to the newer Windows 7 or 8.