Know the Microsoft 365 objects
Explain how licenses, groups, sites and mailboxes work, and which admin center configures each.






























AB-900 is a new Fundamentals exam for people who support and secure an AI-enabled Microsoft 365 environment. Data protection and governance weigh most, 35–40%: Purview, Copilot data access and oversharing, then agent approval. The exam runs 45 minutes, the credential does not expire, and Microsoft expects core services familiarity and AI tool use.
Explain how licenses, groups, sites and mailboxes work, and which admin center configures each.
Describe Zero Trust, authentication methods, Conditional Access, single sign-on and Defender XDR.
Explain how Copilot accesses data through permissions, and use Purview and SharePoint tools to find oversharing.
Assign licenses, manage pay-as-you-go billing, track usage, control agent access and review agent approvals.
We design this course ourselves. Microsoft runs the exam and issues the credential, and LUNARTECH is independent of Microsoft.
Every administrator starts by knowing what exists in a tenant. You learn how users, licenses, groups, SharePoint sites and mailboxes relate, and why a change to one affects the others.
You build A diagram of one sample tenant that shows its users, groups, sites and mailboxes and how they connect.
Microsoft 365 is managed from several consoles, and knowing which to open saves hours. You tour the main admin centers, learn which tasks live in each, and see how admin roles limit what people can change.
You build A task-to-console guide for ten common administrative jobs.
Security in Microsoft 365 starts with who is signing in. You learn the Zero Trust idea, how authentication methods and multifactor work, what single sign-on does, and how Conditional Access decides who gets in.
You build A short plan for a small company that sets sign-in methods and one Conditional Access rule.
Administrators of AI tools still need to know how attacks are spotted. You get to know what Defender XDR covers across mail, devices, identity and apps, and how its alerts and incidents reach the people who handle them.
You build A one-page summary of which Defender product watches which kind of threat.
Copilot can only be as safe as the data controls beneath it. You learn what Purview does to classify and protect information, from sensitivity labels and data loss prevention to insider risk, and why this matters before any rollout.
You build A mapping of five data risks to the Purview feature that addresses each.
Copilot shows what a person is already allowed to see, and that is where trouble starts. You learn how permissions govern its answers, what grounding means, and why old sharing mistakes become visible once Copilot is on.
You build A short risk note that explains to a manager why Copilot can reveal files nobody meant to share.
Before Copilot goes wide, clean up what it could expose. You use Purview and SharePoint tools to find overshared sites and sensitive files, apply labels, and tighten access in a sensible order.
You build An oversharing clean-up plan for a sample SharePoint estate, with the order of work and its checks.
Copilot and agents are related but not the same, and administrators need to tell them apart. You compare chat-style assistance with agents that act, and see where each appears in Microsoft 365.
You build A comparison sheet of Copilot and agents for use in an internal briefing.
AI services cost money in different ways, and administrators answer for the bill. You assign Copilot licenses, learn how pay-as-you-go billing works, and read usage reports to see what people actually use.
You build A licensing and billing plan for a pilot group, with the reports used to review it.
Anyone can build an agent, so someone has to decide which ones run. You set who may create and use agents, review requests, approve or block agents, and keep a record of the decisions.
You build An agent approval procedure with a checklist for reviewing each request.
One scenario joins the course. You review a tenant’s objects, identity and data protection, plan the Copilot and agent rollout, and set up the reviews that keep it under control.
You build A Copilot and agent readiness review for a sample tenant, with a prioritized action plan.

Certifying body · Independent of LUNARTECH
Microsoft publishes its exam outlines and runs its certification program through Microsoft Learn. Exams are delivered through Pearson VUE, and Associate, Expert and Specialty credentials renew each year through a free, unproctored online assessment. LUNARTECH is independent of Microsoft.
Microsoft expects familiarity with Microsoft 365 core services, security, identity, data protection, governance, Copilot, agents and the admin centers, plus experience with AI productivity tools.
Eleven modules, designed by LUNARTECH, at your own pace.
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No single job owns it. Here’s where each role leans hardest, and where its work ends up.
Copilot only returns what a user may already open. Fix the permissions first, then switch it on.
Core services, Data governance
Enterprise IT, Managed service providers
A sign-in problem and a license problem look alike. Know which objects to check first.
Core services, Copilot admin
Enterprise IT, Education
Labels and DLP alerts show where data is slipping. Purview reports turn it into a to-do list.
Data governance
Financial services, Healthcare
Copilot surfaces whatever a person can already open. Oversharing in SharePoint becomes your first finding.
Data governance
Financial services, Healthcare
Rolling out Copilot is an IT project from day one. Licenses, usage and approval all land on your desk.
Core services, Copilot admin
Enterprise IT, Education
Sensitive data reaches AI through the permissions it has. Purview controls decide what Copilot may use.
Data governance
Healthcare, Financial services
Users ask the help desk why Copilot did that. Knowing how it reaches data lets you answer.
Core services, Copilot admin
Managed service providers, Enterprise IT
Copilot only returns what a user may already open. Fix the permissions first, then switch it on.
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Need help? These answers cover most of what people ask before they start.
No. Microsoft issues it. LUNARTECH is independent of Microsoft, and its names and marks belong to it. When you finish a course of ours, you earn a LUNARTECH certificate of completion for that course.
No. We design this course ourselves, around what the exam covers. Microsoft has no part in it, and you still register and book the exam directly with Microsoft.
45 minutes, proctored, in English, Arabic (Saudi Arabia), Japanese, Chinese (Simplified), Chinese (Traditional), Korean, German, French, Indonesian, Italian, Portuguese (Brazil), Russian, Spanish. The passing score is 700 or greater.
Microsoft expects familiarity with Microsoft 365 core services, security, identity, data protection, governance, Copilot, agents and the admin centers, plus experience with AI productivity tools.
Does not expire.
We last reviewed it on 5 November 2026, from Microsoft’s own pages. Details change, so check the official page before you book.
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Show you can support and secure Copilot and agents. Start with a free trial, or enroll in a plan and work through the course at your own pace. Microsoft runs the exam and issues the credential.
LUNARTECH is independent of the vendors and certifying bodies listed here. Their names, exam titles and marks belong to them, exams are run by them, and credentials are issued by them. Reviewed 5 November 2026. Catalogues change often, so confirm the details on the official page before you book.