Windows 10 OEM is a full version of the operating system not an upgrade. The OEM operating system is not supported by Microsoft. To acquire Windows software with support provided by Microsoft please see our full package "Retail" product. Microsoft recommends all files and programs be backed-up prior to installation.Windows 10 OEM is intended for pre-installation on a new PC and cannot be transferred to another computer once installed. Product ships in a white envelope.The Start menu is back and better than ever so you can expand and customize it.Fast and responsive. Technologies like InstantGo let you boot up and resume quickly;Video Game Platform:PCWindows 10 comes with apps that work across your devices - Photos, Maps, Music Video and more.