OEM: The product key is tied to the motherboard on which it is installed and therefore cannot be moved to other computers.
Retail: The product key can be activated on one computer at a time, but can be moved to a new computer if necessary.

Windows 10 is your partner in making things happen. Get faster startups, a familiar but expanded Start menu, and great new ways to get things done, even across multiple devices. You’ll also enjoy innovative features like an all-new browser designed for online action, as well as Cortana, the personal digital assistant that helps you throughout the day. *
* Cortana available in select markets at launch; experience may vary by region and device.

Windows 10. Do great things.
The Start menu is back and better than ever, so you can expand and customise it.
Fast and responsive. Technologies like InstantGo* let you start and resume quickly.
Cortana ** is the personal assistant that learns over time to become more useful to you.
Touch, type, pen ***. Choose what works best for what you do.
Windows 10 comes with apps – Photos, Maps, Video clips and more – that work on all your devices.
Write or type directly on web pages and easily share annotations with your friends.
Install up to four apps on the screen and create new desktops for more space.Join your company or school domain for easy access to network files, servers and printers