Lenovo sells its products in around 160 countries. Lenovo's principal facilities are in Beijing and Morrisville, with research centers in Beijing, Shanghai, Shenzhen, Xiamen, Chengdu, Nanjing, and Wuhan in China, Yamato in Kanagawa Prefecture, Japan, and Morrisville in the U.S. It also has a joint venture with NEC, Lenovo NEC Holdings, which produces personal computers for the Japanese market. Lenovo was founded in Beijing in November 1984 as Legend and was incorporated in Hong Kong in 1988. Lenovo acquired IBM's personal computer business in 2005 and agreed to acquire its Intel-based server business in 2014. Lenovo entered the smartphone market in
ThinkPad X series Windows 7 Enterprise. The specifications<ref name="Notebook Review - Lenovo ThinkPad X201/X201s Review"></ref> of the X201 are given below: The specifications of the X201s are given below: The X201 tablet, released in 2010, was criticized by Engadget for its lack of durability, protruding battery, and thick body, while praised for its performance. Notebook Review had similar views about the X201 tablet in terms of both performance and battery life while indicating that the display was superior to that of the X201 or X201s. The ThinkPad X-series laptops released in 2011 by Lenovo were the X120e, X220, X220i, X220 tablet and X1.