In today’s digital landscape characterized by connectivity and remote collaboration, email is the lifeline for communication, and the prime vector for malicious actors seeking to exploit user vulnerabilities. Recognizing this, Microsoft has bolstered its email security arsenal with Defender for Office 365 (MDO), formerly known as Advanced Threat Protection (ATP), as an additional layer to Exchange Online Protection (EOP). While advanced features like Safe Links and Safe Attachments have rendered traditional secure email gateways less relevant and empowered Microsoft customers to transition away from them, the reality is that only by supplementing Microsoft with an additional AI-based email security solution can organizations achieve sufficient protection against BEC and advanced phishing attacks.