Lisa Gade walks through the features and new look of Windows 10. We use the final version that Microsoft made available early to Windows Insider testers, which will be available to all on July 29, 2015. Windows 10 is free if your computer or tablet is running Windows 7, 8 or 8.1 (you have a year to grab the upgrade and must have a legal copy of Windows installed). It features the return of the Start Menu, Cortana the virtual assistant with voice search and a more unified user experience that does away with the separation between Metro and desktop app environments. It’s a lightweight, fast and solid operating system from the folks at Redmond.