At Microsoft's BUILD conference today, the company announced that the Start Menu will officially be returning to Windows 8.1. It will combine the Windows 7 Start Menu with a handful of Metro-style tiles. They're also making it so Windows 8 apps can run in windows using the normal desktop environment. In addition to the desktop announcements, Microsoft also talked about big changes for Windows on mobile devices and Internet-of-Things devices. The company will be giving Windows away for free to OEMs making phones and tablets (9" screens and smaller), and for IoT devices that can run it. Microsoft also finally unveiled Cortana, their digital assistant software that's similar to Siri.