Communication uses outgoing TCP/UDP on ports 1493, 1542, 1863 & 1963
Messenger Sign in uses TCP/UDP 1484, 2400 with a destination of port 443.
blocking those should kill it. Or at least it did when I was a network manager 
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A foolish consistency is the hobgoblin of little minds
Thought for today:- Is SEO the only industry where all the cowboys are Indians?
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