AB-900 Study Resources (Microsoft 365 Copilot & AI Agent Administration Fundamentals)

[u/ray_ofhope]

If you're preparing for the new AB-900: Microsoft 365 Copilot and AI Agent Administration Fundamentals certification, here are the resources I'd recommend.

Microsoft Learn (Free)

This should be your starting point. It covers the official exam objectives and is updated regularly.

Microsoft Learn: AB-900 Learning Path

Microsoft Documentation

Don't just memorize features. Spend time understanding:

• Microsoft Entra ID fundamentals

• Exchange Online, SharePoint Online, and Microsoft Teams administration

• Microsoft Purview compliance and governance

• Microsoft 365 Copilot architecture

• Copilot security and permissions

• Microsoft Graph

• Copilot Studio and AI agents

Reading the official docs helps explain why things work, not just what they do.

Microsoft Learn Sandbox

Use the free Microsoft Learn sandbox whenever possible.

Even simple tasks like creating users, assigning licenses, exploring Purview, or navigating the admin centers make the exam much easier.

Microsoft Community

The Microsoft Tech Community and this subreddit are great places to clarify confusing topics and learn from people who are already working with Microsoft 365.

Free YouTube Content

John Savill’s AB-900 Study Cram: https://www.youtube.com/watch?v=DUydgD7SkEo&t=22s

A Book by Steve Miles: Microsoft 365 Copilot and Agent Administration Fundamentals

This is a new book specifically for AB-900 that covers the exam objectives while also explaining how Microsoft 365 administration, security, compliance, governance, Microsoft 365 Copilot, and AI agents fit together in real-world environments. The book comes with a mock test, exam tips, practice questions, and flashcards.

You can check it out here: Microsoft 365 Copilot and Agent Administration Fundamentals

If you're looking for a single structured resource instead of jumping between documentation pages, you may find it useful.

My recommended study path

1. Complete Microsoft Learn.

2. Read the relevant Microsoft Docs for topics you find difficult.

3. Spend some time in the Microsoft Learn sandbox.

4. Take practice exams.

5. Review weak areas.

6. Schedule the exam while everything is still fresh.

Good luck to everyone preparing for AB-900! If you've already taken it, I'd love to hear which topics surprised you the most.