Communication Compliance with Microsoft Purview
Message Monitoring Policies, Trainable Classifiers, and Employee Privacy Controls for Microsoft 365 Administrators
This is the companion page for Communication Compliance with Microsoft Purview. If the book is in your hands, start with the placement quiz: it tells you which chapters to read first. The chapter map, the hardest SC-401 questions answered in full, and the topics sitting just outside the book are all on this page.
What this guide covers
Communication Compliance is the most politically loaded tool in Purview. It reads your employees' messages across Teams, Exchange, Viva Engage, Microsoft 365 Copilot, and connected third-party sources, looking for harassment, threats, regulatory violations, and code-of-conduct breaches. Deploy it carelessly and you have built workplace surveillance that your works council and your lawyers will rightly tear apart. Deploy it well and you have a defensible, privacy-respecting control that catches real problems early. The difference is almost entirely in the configuration and the governance around it.
That governance is the whole game, and it is where most of this book lives. Who can see what, how reviewers are scoped, how identities are pseudonymized, and how you prove the program is fair rather than a fishing expedition. The mechanics are the easy part. Whether you are allowed to monitor, and whether you can defend the program when someone asks why you are reading their messages, is the real work, and Microsoft scatters that answer across a dozen disconnected pages.
This is the connected account those pages never assemble in one place. Every policy path, license boundary, classifier, and privacy setting is grounded in current Microsoft Learn and validated in a live Microsoft 365 E5 lab, not asserted from memory. You do not need a production tenant to follow along. A Microsoft 365 E5 trial and a willingness to generate a few test messages are enough to build and review a real policy end to end.
Chapter map
- What Communication Compliance Is, and the Privacy Tightrope
- Licensing and Prerequisites
- Policies and Templates
- Building a Policy: Scope, Conditions, and Review
- The Classifiers: Trainable Classifiers, Threats, Harassment, and Regulatory
- Reviewing Alerts and Investigating Messages
- Remediation, Escalation, and Notifications
- Privacy, Pseudonymization, and the Governance Model
- Reporting and Tuning
- Operational Reality: Coverage, Gotchas, and Troubleshooting
Appendices: PowerShell for Communication Compliance; Microsoft Learn Bibliography; Communication Compliance Readiness Checklist.
Who it is for
This book is for the security, compliance, and risk engineers standing up or auditing a Communication Compliance program who want one document that connects the policy machinery the docs leave scattered, for the HR, legal, and privacy stakeholders who own the policy the tool enforces and have to defend it, for the reviewers and investigators who triage alerts and need to know exactly what they can and cannot see, and for anyone working toward the Microsoft Applied Skills credential "Implement retention, eDiscovery, and Communication Compliance in Microsoft Purview," which puts this product squarely on the assessment.
See where you are
5 questions from this guide's territory (1 easy, 4 medium), with the explanation after each. Nothing is stored and nothing is sent anywhere.
The rest of Microsoft Purview Field Guides
One product per book, a lab appendix in every one, and a companion page like this one for each.
Field guideAudit, Alerts, and Investigation with Microsoft Purview
The what-happened ticket arrives with a deadline, and the event you need aged out of the audit log months ago. The investigation surface, in the order you use it.
Field guideData Loss Prevention with Microsoft Purview
Turn on Microsoft Purview DLP the way the wizard suggests and you get one of two outcomes: a wall of false positives nobody reads, or a policy so timid it protects nothing.
Field guideeDiscovery and Legal Holds with Microsoft Purview
When legal hands you a hold notice, the clock is real and the stakes include sanctions. Holds preserve and searches collect, so a matter you searched but never held can quietly lose data before anyone notices.
Field guideInsider Risk Management with Microsoft Purview
There is no button that blocks the leak.
Field guideData Retention and Records Management with Microsoft Purview
Nothing visibly breaks when retention is wrong.
Field guideSensitivity Labels and Data Classification with Microsoft Purview
Classify your data once and the protection travels everywhere. That is the pitch.
Exam prep? The SC-401 sampler scores you by topic and points you to the guide behind each miss.
Take the SC-401 sampler Every SC-401 practice question, with explanations