On February 4, 2014, Steve Ballmer stepped down as CEO of Microsoft and was succeeded by Satya Nadella, who previously led Microsoft's Cloud and Enterprise division. On the same day, John W. Thompson took on the role of chairman, with Bill Gates stepping down from the position, while continuing to participate as a technology advisor. On April 25, 2014, Microsoft acquired Nokia Devices and Services for $7.2 billion. The new subsidiary was renamed Microsoft Mobile Oy. In May 2016, the company announced it will lay off 1,850 workers, taking an impairment and restructuring charge of $950 million. During the previous summer of 2015 the company wrote down $7.6 billion related to its mobile-phone business and fired 7,800 employees from those operations. On September 15, 2014, Microsoft acquired the video game development company Mojang, best known for its wildly popular flagship game "Minecraft", for $2.5 billion.