The company unveiled the Windows 10 consumer preview on Wednesday, showcasing some of the new features in the latest version of the operating system that powers the vast majority of the world’s desktop PCs. The developer preview has been available since Microsoft first announced Windows 10 in the fall, but it was buggy, limited in scope and very light on new features. Importantly, Windows 10 will be free for existing Windows users running versions of Windows back to Windows 7. That includes Windows 7, 8, 8.1 and Windows Phone. Microsoft specified it would only be free for the first year, indicating Windows would be software that users subscribe to, rather than buy outright. Microsoft Corporate Vice President of the Operating Systems Group Joe Belfiore showed off some of the new features in Windows 10.