Looking back on 2015, Microsoft's biggest year ever

With major product announcements and a number of big bets on the future, 2015 is in the running to be one of Microsoft's most important years on record.Topping it was the launch of Windows 10. First previewed a year earlier, 2015 was the year we finally got to see the new operating system in full. Microsoft unveiled key features, including its virtual assistant Cortana reaching beyond Windows Phone and onto the desktop, and its new Edge web browser.Windows 10 also brought a new Windows Univ