It is really a good application, by the words you wrote. But the features seem to be less than other famous IM applications. I use WLM 2011 and works perfectly, which even brings your photos on facebook to your IM.  I really like WLM. I also have a post on Chit Chat. Have a look. http://www.techlikes.com/2010/12/facebook-chat-desktop-client-windows.html