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Microsoft · Cloud · Entry

Microsoft 365 Fundamentals exam guide

Exam AB-900 (replaced MS-900, retired March 31, 2026)

MS-900 (Microsoft 365 Fundamentals) retired on March 31, 2026. Microsoft's replacement is AB-900: Microsoft 365 Copilot and Agent Administration Fundamentals, which covers core Microsoft 365 services plus data protection, governance and basic administration of Copilot and agents.

QuestionsSee official page
Time limit45 minutes
Passing score700 (1-1000 scale)
Exam fee$99 USD
Valid forSee official page
DeliveryPearson VUE test center or online proctored

Format: Multiple choice, drag-and-drop and hot area. Fee note: US price; varies by country. Student and Microsoft Learn challenge discounts sometimes available.

Who it's for

New Microsoft 365 administrators, help desk staff, and business users who will support Microsoft 365 and Copilot rollouts.

What the exam covers

Identify the core features and objects of Microsoft 365 services (30-35%)—
Understand data protection and governance tasks for Microsoft 365 and Copilot (35-40%)—
Perform basic administrative tasks for Copilot and agents (25-30%)—

A dash means the vendor does not publish a weight for that domain.

Eligibility & prerequisites

Required: None

Recommended: General familiarity with Microsoft 365 apps and basic IT administration concepts.

Keeping it active

Fundamentals certifications do not expire; no renewal required.

Skills & careers

Skills it validates

  • Core Microsoft 365 services: Exchange, SharePoint, OneDrive, Teams
  • Microsoft 365 admin center objects (users, groups, licenses)
  • Data protection and governance with Purview for Copilot
  • Permissions and oversharing controls that affect Copilot
  • Basic Copilot and agent administration

Job roles

Microsoft 365 Administrator (junior)Help Desk TechnicianIT Support SpecialistCopilot Adoption SpecialistModern Workplace Consultant

Where it fits in your path

Planning a degree too? See how this cert earns college credit in the College Credit Navigator.

Build my study plan

  1. Days 1-4: Read the AB-900 study guide; tour the Microsoft 365 admin center in a trial tenant
  2. Days 5-9: Data protection and governance (largest domain) - sensitivity labels, permissions, oversharing, Purview basics
  3. Days 10-12: Copilot and agent admin tasks - licensing, settings, agent management
  4. Days 13-14: Free practice assessment and review

Make it yours: pick your exam date and weekly hours. We'll split your time by domain weight and give you a printable plan.

Exam-day tips

  • Data protection and governance is the largest domain - know how permissions drive what Copilot can surface
  • Older MS-900 material misses Copilot and agent objectives entirely
  • Fundamentals exams do not allow Microsoft Learn access during the test
  • Know which admin center (Microsoft 365, Entra, Purview) hosts each setting mentioned in a question

Key terms for this exam

All 5 terms Study with thinQcards™

Commonly confused on this exam

Frequently asked questions

Is MS-900 still available?

No. It retired March 31, 2026. AB-900 is the replacement fundamentals exam.

Does my MS-900 certification still count?

Yes, fundamentals certifications do not expire and remain on your transcript.

How much is AB-900?

$99 USD in the United States.

Is AB-900 required for other Microsoft 365 certs?

No, it is optional, but it is a good on-ramp to MD-102, MS-700 and Microsoft 365 administration exams.

How long should I study?

About 1-2 weeks for people already using Microsoft 365.

Official page: learn.microsoft.com. Reviewed November 2026. Vendors change fees and objectives, so confirm with the vendor before you book. Spot something out of date? Tell us.