Microsoft has yet to release the Messenger SDK or approve its web integration code for use outside of its MSN properties.
While you can build the code yourself and access it, they haven't provided the resources to do so. I have seen their code. It is long and complicated but an elegant implementation of Javascript. If they released an SDK, I would put that code up in a heartbeat on my site. However since they haven't I won't infringe on their rights.
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