Spamhaus: Microsoft Now 5th Most Spam Friendly ISP - Security Fix

"'We have been notifying Microsoft about this for some months now at a high level that the abuse at livefilestore.com we believe now exceeds any genuine use of that service that may exist,' Cox said. He added that while Spamhaus has not yet listed any major Microsoft properties on its block list, it has listed a couple of smaller Microsoft domains to get their attention."