For one of my pet projects I am writing, I was contemplating how to integrate Windows Live Authentication with my standalone application, similar to Windows Live Messenger. Turns out, it is really easy! Below are the three steps that were needed for the integration: Download the Windows Live Client SDK from here and install it. Create a new project and add reference to Microsoft.WindowsLive.Id.Cl... assembly Write code similar to the one below: using System; using Microsoft.WindowsLive.Id.Cl...;...