Microsoft Windows 10 Pro 64 Bit System Builder OEM Note:OEM and OEI are the same thing. The Start menu is back and better than ever so you can expand and customize it. Key Included Join your business or school domain for easy access to network files, servers, and printers. Login with Remote Desktop and create virtual machines with Hyper-V;BitLocker & Enhanced encryption 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. 	NOTE: Installation is only possible when using a clean (blank) machine with no other prior version of Windows already installed. Product ships in a white envelope. Product Key is below scratch off Microsoft label.