To help reduce the consequences of junk email, Outlook.com includes junk email protection using patented SmartScreen® technology which screens email to identify and separate junk email from legitimate email. Based on Microsoft Research's patented machine-learning technology, the SmartScreen® content filter learns from known spam and phishing threats, user feedback, as well as from Outlook.com users who have opted to be part of our junk email classification program. These types of data help train SmartScreen® how to recognize legitimate email and junk email and are key inputs into sender reputation. Machine learning refers to the probability-based algorithms that are used to distinguish between the different characteristics of legitimate and junk email. Ongoing feedback from Outlook.com customers in the junk email classification program helps ensure that the SmartScreen® technology is continually trained and improved., Access personal, work, or school emails in the Outlook app on desktop and mobile, including Outlook.com, Gmail, Yahoo!, iCloud, and more., JavaScript must be enabled. Outlook. JavaScript must be enabled. Outlook.