Microsoft codename "Menlo" is a Microsoft Research project to investigate new operating system possibilities in the mobile space. A Microsoft research paper entitled "User Experiences with Activity-Based Navigation on Mobile Devices," about Menlo is now published. Quote from the paper: "Menlo is a prototype mobile device with a capacitive touch screen (4.1? diagonal, 800×480) running Windows Embedded CE 6.0 R2 which incorporates a Bosch BMA150 3-axis accelerometer and Bosch BMP085 digital pressure sensor (barometer)."
Running on top of Menlo is a new Silverlight app codenamed "Greenfield," which's a sensor-centric program allowing users to retrace their footsteps when seeking to find their cars.
Microsoft included an image of a Menlo device in the paper:
Reference: Research Paper