These two solutions look similar on a licence sheet and do very different jobs. One reads what people say, the other scores what people do.
Communication Compliance: detects offensive, profane or harassing language, adult or gory images, and sharing of sensitive information across Teams chats and channels, Exchange, Viva Engage and Copilot prompts. It can remove a message from Teams or notify the sender, which makes it the answer for workplace harassment and for regulatory conduct rules.
Insider Risk Management: correlates user behaviour signals for intellectual property theft, data leakage and security violations, using policy templates and feeding Defender XDR and Adaptive Protection. It scores risk and builds cases; it never deletes content.
Both are privacy-by-design, with usernames pseudonymized by default, role-based access for investigators and full audit logs, and both are E5 class rather than E3. Confirming an Insider Risk alert can create a dedicated team for the case and archive it when the case is resolved.
Exam tip: If the scenario is about the content of a message, it is Communication Compliance. If it is about a pattern of behaviour by a person, it is Insider Risk Management.
Microsoft Learn resource: Microsoft Teams and Microsoft Purview Communication Compliance (opens in a new tab)