The number one cause of all breaches is email, at a whopping 90%. As such, email security services are under duress to identify threats before they happen. With email-borne attacks increasing dramatically over the last few years, and the sophistication rising along with it, email security is under scrutiny. In this report, Avanan researchers analyzed over three million emails to determine how Microsoft Defender, and others, fare against the most advanced, evasive and sophisticated threats.