Android (operating system) and rival Linux mobile operating systems that were in development. These established players were skeptical: Nokia was quoted as saying "we don't see this as a threat," and a member of Microsoft's Windows Mobile team stated "I don't understand the impact that they are going to have." Since then Android has grown to become the most widely used smartphone operating system and "one of the fastest mobile experiences available". Reviewers have highlighted the open-source nature of the operating system as one of its defining strengths, allowing companies such as Nokia (Nokia X family), Amazon (Kindle Fire), Barnes & Noble (Nook),
Plug-in electric vehicles in Norway By July 2016, the market concentration had increased to 21.5 registered plug-in cars per 1,000 people, 3.6 times higher California's, the leading American market, and 14.2 times higher than the U.S. average concentration, then the world's largest country market. The Norwegian plug-in electric car market share of new car sales is the highest in the world. The segment's market share rose from 1.6% in 2011, to 3.1% in 2012, and reached 5.6% in 2013. Only the Netherlands, with 5.34% in 2013, achieved a similar market share. In 2014 the overall plug-in car take rate climbed to 13.8%, and reached 22.4%