Microsoft AB-900: Copilot and Agent Administration Fundamentals Study Guide [80 Minute Read]

A First-Principles Approach to Microsoft 365 Administration and AI Governance

This guide builds your mental model of how Microsoft 365 works — not just what its features are called. Every section answers three questions: why this matters in practice, how to think about it conceptually, and where the exam likes to trip you up. By the end, you won't just recognize the right answer — you'll be able to reason your way to it.

Official Exam Objectives: AB-900 Study Guide — Microsoft Learn

AB-900 is a Fundamentals-level exam with broad coverage and minimal depth per topic. Questions lean toward understanding and application — expect scenarios like "a company wants to do X, which tool should they use?" rather than pure recall. The exam includes approximately 40–60 questions, and you have 45 minutes. Passing score is 700/1000. No prerequisites are required.

Exam Domain Weights

Data Protection and Governance is the heaviest domain — nearly 40% of the exam. Spend the most study time on Microsoft Purview and Copilot data security. The Copilot and Agent Administration domain is new territory for most candidates, so don't underestimate it.

---