Microsoft is promising the next update to Windows 10 will be its biggest in years. During his keynote at Tuesday's Build developer conference, CEO Satya Nadella teased that major changes are in store for the operating system. "Soon we will share one of the most significant updates to Windows of the past decade to unlock greater economic opportunity for developers and creators,” he said. “I’ve been self-hosting it over the past several months, and I’m incredibly excited about the next generation of Windows.” The comment is pretty interesting on two levels. For one, Windows 10 has only existed for six years, going back to the initial release in July 2015. So according to Nadella, the update should be bigger than anything Microsoft has released since the 2009 launch of Windows 7. (Windows 8 arrived in October 2012.)