Microsoft released Windows 7 on October 22, 2009. By January 2011, it had sold 300 million copies. On October 26, 2012, the company released Windows 8 and has confirmed that it sold only 200 million copies in February 2014. In May last year, Microsoft confirmed that it had sold 100 million licenses which was a good start despite drops in PC sales due to the growth of tablet market.
Market analysts speculate that the recent surge in demand of tablets has affected PC sales, which has subsequently affected sales of the latest Microsoft PC operating system.
Last month, the research firm, Gartner Inc. confirmed that Windows 8 had failed to boost the PC market. It also said that global PC shipments had declined by 4.9 percent in the fourth quarter of 2014.