MSN/Windows Live Messenger (and now Skype) do support federation with Lync Server, which is Microsoft's corporate instant messaging server. Over the years, Mic

MSN/Windows Live Messenger (and now Skype) do support federation with Lync Server, which is Microsoft's corporate instant messaging server. Over the years, Microsoft has tried various attempts at making MSN/WLM interoperable with AIM, XMPP, and ICQ -- albeit with limited success.