AB-900 Practice Test, Practice Questions and Exam Prep From Your Own Copilot and Agent Admin Notes

MS-900 asked you to describe things. AB-900 asks you to do them.

Microsoft did not simply rename its Microsoft 365 fundamentals exam. It changed what the exam is for, and the clearest evidence is in the verbs. We counted every verb in the skills-measured section of both official study guides: the retired MS-900 guide and the live AB-900 guide. They are almost exactly the same length, 676 words against 655, so the comparison is fair.

Fifty-four to zero. MS-900 was a describe-level exam from its first bullet to its last, and that is exactly how it was taught: flashcards of product names, a week of memorizing what SharePoint is for, done. AB-900 never once asks you to describe anything. It asks you to identify objects, understand tasks, and perform, configure and monitor real administration.

That matters for how you study, and it is why a recycled MS-900 question bank is worse than useless here. Recall questions will not prepare you for an exam whose largest domain is governance tasks. Feed the current study guide and your own admin-center notes into a generator and build a question bank from your own Copilot administration notes instead of drilling a bank written for an exam that no longer exists.

AB-900 skills measured, straight from Microsoft's study guide

Three domains, not MS-900's four. Governance is the biggest thing on the paper, which is not where anyone expects a fundamentals exam to put its weight.

Add the first and third rows together and 60 to 70 percent of AB-900 is governance plus hands-on Copilot and agent administration. Only 30 to 35 percent is the "what is Microsoft 365" material that used to be nearly half of MS-900. If you are preparing from an MS-900 course, you are studying a third of the right exam.

Weights and bullets are current as of the study-guide version stamped July 22, 2026. Microsoft publishes no question count for AB-900 and no pass rate for any exam. Its general guidance is that most exams contain 40 to 60 questions. The passing score is 700 on a scale of 1 to 1000, and Microsoft notes a scaled score may not equal 70 percent of the points.

AB-900 questions, answered

What is Exam AB-900?

AB-900 is Microsoft 365 Copilot and Agent Administration Fundamentals. It earns the Microsoft 365 Certified: Copilot and Agent Administration Fundamentals certification. It is a live, generally available fundamentals exam with no prerequisite, and its skills were last stamped as of July 22, 2026. It is the Microsoft 365 fundamentals certification that now stands where MS-900 used to.

Did AB-900 replace MS-900?

In practice, yes, though Microsoft never printed the words "AB-900 replaces MS-900." MS-900 retired on March 31, 2026. The announcement that retired it promised a new fundamentals certification covering core Microsoft 365 services including Copilot and agents, plus identity and compliance essentials in Microsoft Entra and Microsoft Purview. That description matches AB-900 line for line, and AB-900 is now the only Microsoft 365 fundamentals certification on offer. We are telling you what Microsoft implied rather than what it stated, because the difference matters and most prep sites will not make it.

What are the AB-900 domain weights?

Three domains. Understand data protection and governance tasks for Microsoft 365 and Copilot is the largest at 35 to 40 percent. Identify the core features and objects of Microsoft 365 services is 30 to 35 percent. Perform basic administrative tasks for Copilot and agents is 25 to 30 percent.

How is AB-900 different from MS-900?

It is a different kind of exam wearing the same fundamentals badge. The word "describe" appears 54 times in the retired MS-900 outline and zero times in AB-900, replaced by "identify" 26 times, "understand" 23 times, and "perform" 4 times. Two whole MS-900 domains are gone: cloud concepts, and pricing, licensing and support. Copilot went from 5 mentions to 18, and Purview from 2 to 15.

How much does the AB-900 exam cost?

Microsoft does not list AB-900 in its published exam pricing feed, so no honest source can quote you a confirmed AB-900 fee. Every Microsoft fundamentals exam that is in the feed, including AZ-900, SC-900 and DP-900, is $99 in the United States, so $99 is the reasonable expectation. Confirm the price at checkout before you book, and treat any site stating a firm AB-900 price as guessing.

How many questions are on the AB-900 exam?

Microsoft publishes no question count for AB-900, and it publishes no pass rate for any of its exams. Its general guidance is that most exams contain 40 to 60 questions. Any site quoting an exact AB-900 question count or a pass percentage invented it. The passing score is 700 on a scale of 1 to 1000.

Is AB-900 worth it?

It is worth more than MS-900 was, because it tests work rather than vocabulary. Nearly two thirds of the paper is data protection, governance, and hands-on Copilot and agent administration, which is what employers are hiring for right now. If you want a Microsoft 365 credential in 2026, it is the only fundamentals option left.

Does my MS-900 certification still count?

Yes. Microsoft states that already-earned fundamentals certifications stay on the Active Certifications section of your Microsoft Learn transcript and do not expire. You keep the credential. What you cannot do is sit the MS-900 exam, which stopped being offered after March 31, 2026.

PDFQuiz is not affiliated with, endorsed by, or sponsored by Microsoft. Microsoft, Microsoft 365, Copilot, Entra, Purview and SharePoint are trademarks of the Microsoft group of companies. This generator builds practice questions from material you upload and is a study aid, not a substitute for Microsoft's official learning paths. AB-900 is a recent exam and its details are still settling: always confirm on Microsoft's own pages before you book.