What Microsoft Missed: Essential Add-Ons for Organisations Relying on Microsoft 365 Email

Microsoft 365 is the backbone of email and collaboration for organisations across Australia, from private enterprises to federal agencies. While Microsoft provides native email security through Exchange Online Protection (EOP) and optional Defender for Office 365, these tools alone are no longer enough.

Today's targeted cyberattacks are designed to bypass default protections, and many IT teams fail to enable or correctly configure advanced policies even when Microsoft Defender is fully licensed. The result: critical threats slip through, often unnoticed until the damage is done.

Based on real-world testing, industry analysis, and input from ICT leaders across sectors, this report reveals the common blind spots in Microsoft 365 email security and explains why layered security, already standard for endpoint, identity, and network protection, must extend to email.

Key Points

• Where Microsoft's native email defences break down against targeted attacks
• The risks of relying on a single-layer, single-vendor email security model
• Why advanced Defender policies are commonly misconfigured or left disabled
• The case for layered email security as standard practice