A quick note from something that I learned the hard way:  Windows 10 fast ring, specifically builds 14905 and 14915 do not work well with Docker 1.12.0.

In my experience, the Docker for Windows application would start and appear in the Task Manager but would not go to the system tray or appear on the task bar. My work-around to this is to install the latest beta of Docker 1.12.1 from https://download.docker.com/win/beta/InstallDocker.msi

This is likely a point-in-time break with both the Windows 10 and Docker teams iterating quickly on their products.