IronSights

Microsoft 365 & cloud

Microsoft Defender for Office 365MDO

A Microsoft 365 security product that protects against advanced email threats including phishing, malware, and business email compromise through Safe Links, Safe Attachments, and anti-phishing policies.

Also known asMDODefender for Office 365Defender for O365

In plain English

MDO is the layer of protection that sits on top of Exchange Online to catch threats that standard spam filtering misses. It detonates email attachments in a sandbox to test for malware, rewrites URLs to scan them in real time before you click, and uses AI to detect impersonation attacks targeting your executives.

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More terms in the IronSights Glossary.