The Pirate Bay walks the plank on Windows Live Messenger?
Found on CNet News on Monday, 26 March 2012

When users try to send an instant message to a friend with a link from The Pirate Bay, Windows Live Messenger displays a warning, saying that the link is "blocked because it was reported as unsafe."
Microsoft's apparent decision to block The Pirate Bay might conjure up privacy fears among those who don't necessarily want the software giant limiting what they can and cannot do on the service.
According to TorrentFreak, however, The Pirate Bay appears to be the only major downloading site affected. Other prominent sites, according to the blog, can still be accessed via links in Windows Live Messenger.
With enough criticism, Microsoft will simply claim it was an error and remove the block again. This is why it would be nice to have client-to-client encryption in every chat client.