Download Windows 10 IoT Core for Raspberry Pi 2 / 3
This is the core OS image that powers Windows IoT platform on Raspberry Pi 2 & 3. Windows 10 IoT Core is the smallest version of the Windows 10 editions that leverages the Windows 10 common core architecture. This edition enables building low-cost devices with fewer resources.
Read the entire article here, Download Windows 10 IoT Core for Raspberry Pi 2 / 3 from Official Microsoft Download Center
via the fine folks at Microsoft Remote Desktop Services (Terminal Services) Team Blog