Hotmail's fight against spam has certainly come a long way in the last five years. Over the last several years we've made substantial investments in the research and development of sophisticated anti-spam technologies. SmartScreen is the collective name we use for a cloud-based set of technologies and algorithms that leverage machine learning and artificial intelligence to assign a “spam probability” score to each incoming message. This enables us to filter out over 98% of the spam sent to Hotmail inboxes, blocking 5.5 billion spam messages per day. Microsoft utilizes SmartScreen across Hotmail, Microsoft Exchange, and Microsoft Forefront, bringing consumers the benefit of business-grade spam protection on Hotmail.
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