* Keyboard and Office applications sold separately with Surface Pro 3. Keyboard and Pen sold separately with Surface 3. 1 Free upgrade to Windows 10. Offer valid for qualified Windows 8.1 devices for one year after Windows 10 upgrade availability. Windows 10 features vary by device. See www.windows.com/windows10specs and www.surface.com/upgrade for details." 2 Sold separately. 3 Cortana available in selected global markets at launch; experience may vary by region and device.