MS-900 Retired 2026: FREE Guide + AB-900 Pivot

MS-900 in 2026: What Changed and What This Guide Covers

Microsoft retired the MS-900 Microsoft 365 Fundamentals exam on March 31, 2026. If you are reading this guide in April 2026 or later, the exam is no longer schedulable — but the Microsoft 365 knowledge it validated is more valuable than ever, and the credential you may have earned before retirement is still permanent.

This guide is written for three audiences:

1. You already passed MS-900 — and want a 2026-current reference for what it covered, whether it still matters on your resume, and what to stack on top of it.
2. You were studying for MS-900 — and need to know where to pivot (hint: AB-900 Microsoft 365 Copilot and Agent Administration Fundamentals is the official successor).
3. You want to learn Microsoft 365 fundamentals in 2026 — and want to know whether the free MS-900 Microsoft Learn modules are still valid study material (they are).

We cross-referenced this guide against learn.microsoft.com/credentials/certifications/microsoft-365-fundamentals/, the official MS-900 study guide (last updated March 2025), the AB-900 study guide, and Microsoft's 2026 certifications refresh announcement.

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MS-900 At-a-Glance (Historical Reference)

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Why MS-900 Was Retired (and What Microsoft Replaced It With)

Microsoft's March 2026 certifications refresh was an AI pivot. The announcement argued that the Microsoft 365 of 2026 — where Copilot, agents, and Purview DSPM for AI are central — is fundamentally different from the Microsoft 365 MS-900 was designed to validate in 2020.

Two things happened simultaneously:

1. MS-900 retired on March 31, 2026, along with several other legacy fundamentals and role-based exams.
2. AB-900 launched as the new AI-centric Microsoft 365 fundamentals credential.

A Microsoft Learn Expert confirmed in the community thread that AB-900 overlaps only about 20-25% with the retired MS-900 content. That is the key takeaway: AB-900 is not a direct rebrand. It is a new credential with a heavier Copilot, agents, Entra ID, and Purview lens, and with an administration-leaning scope that was previously only implied in MS-900.

Bottom line: If you want the MS-900 credential itself, that door closed on March 31, 2026. If you want a Microsoft 365 fundamentals credential in 2026, you want AB-900.

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Does MS-900 Still Matter on Your Resume?

Yes. Three reasons.

1. The credential is permanent. Microsoft's own certification renewal page states plainly: "Fundamentals certifications do not expire." If you passed before March 31, 2026, Microsoft 365 Certified: Fundamentals stays on your Microsoft Learn transcript forever with no renewal required, no continuing-education hours, and no retake.

2. It still signals real knowledge to hiring managers. A 2026 HR screen looking at your resume sees Microsoft 365 Certified: Fundamentals and reads it the same way they read any other Microsoft entry-level cert: evidence that you understood cloud concepts, Microsoft 365 apps and services, security/compliance, and licensing at a baseline level. Retirement of an exam does not retroactively devalue prior passers.

3. It is a prerequisite signal for role-based stacking. Candidates who hold MS-900 plus MS-102 (Microsoft 365 Administrator Expert) or SC-900 (Security, Compliance, and Identity Fundamentals) are visibly on a Microsoft admin career track. The Fundamentals credential is a trusted first step.

What changed: you can no longer earn this credential. You can only keep it if you already did.

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The Four MS-900 Domains (Final Outline, April 30, 2025)

Even though you can no longer sit MS-900, the final skills outline is the best map of what a 2026-ready Microsoft 365 generalist should know. This is the outline Microsoft published in its last MS-900 refresh.

Apps and services was roughly half the exam. Any self-study plan should reflect that weight.

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Skill 1 — Cloud Concepts (5-10%)

The smallest domain. It tested whether you could distinguish cloud service models and deployment models at a conceptual level.

What You Must Know

The single most-tested distinction: Office 365 ≠ Microsoft 365. Microsoft 365 is the bundle that also includes Windows and Enterprise Mobility + Security. Old study materials that blur these two are out of date.

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Skill 2 — Microsoft 365 Apps and Services (45-50%)

The main event. This domain had four sub-skills covering roughly half the exam.

Sub-skill 2a: Productivity Solutions

Sub-skill 2b: Collaboration Solutions

Sub-skill 2c: Device and Cloud Endpoint Management

Windows 365 vs Azure Virtual Desktop was a repeated MS-900 scenario: Windows 365 = per-user, fixed-price, single-session; AVD = multi-session, consumption-priced, more admin work.

Sub-skill 2d: Microsoft 365 Administration Capabilities

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Skill 3 — Security, Compliance, Privacy, and Trust (25-30%)

The second-largest domain, and the one that most overlaps with the new AB-900.

Sub-skill 3a: Identity and Access Management

Sub-skill 3b: Threat Protection

Sub-skill 3c: Trust, Privacy, Risk, and Compliance

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Skill 4 — Pricing, Licensing, and Support (10-15%)

The administrative domain. Practical, rote, and the easiest place to pick up points.

Pricing and Billing

License Management

• Base licenses (e.g., Microsoft 365 E3) vs add-on licenses (e.g., E5 Security add-on, Teams Phone add-on, Copilot add-on)
• Assignment via the Microsoft 365 admin center — user-based and group-based licensing
• Subscription vs perpetual licensing — Microsoft 365 is subscription-only

Support

• How to create a support request in the Microsoft 365 admin center
• Support tiers — Standard, Professional Direct, Unified
• Service-level agreements (SLAs) and service credits for downtime
• Service health status — Microsoft 365 admin center or Microsoft Entra admin center

License SKU Map (Memorize These)

Scenario questions loved to ask which SKU fit a specific workforce description — retail associates with no desktop = F1/F3; 500-person law firm = E3 or E5; 50-person startup = Business Premium.

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AB-900: The Current Microsoft 365 Fundamentals Path

AB-900 is now the credential to earn in 2026 if you want a Microsoft 365 fundamentals certification on your transcript. Microsoft announced it on November 13, 2025, opened a public beta that same week, and moved the exam to general availability in February 2026. The first 300 beta candidates who registered on or before January 3, 2026 with code AB900Goals26 got 80% off market price.

AB-900 At-a-Glance

AB-900 Skills Measured

Data protection and governance is the single largest domain on AB-900 at 35-40%, reflecting Microsoft's bet that the main admin pain point of the Copilot era is data governance: sensitivity labels, DLP, Purview DSPM for AI, Insider Risk Management, Communication Compliance, retention, and Copilot permissions.

Key AB-900 Concepts You Did Not See on MS-900

• Microsoft Purview DSPM for AI — new Data Security Posture Management lens specifically for Copilot and agents
• How Copilot accesses data — Microsoft Graph grounding, permissions inheritance, Purview controls
• Creating and approving agents — Copilot Studio, Copilot Agent lifecycle, approval workflows
• Copilot licensing — monthly license vs pay-as-you-go (PAYG), including SharePoint PAYG
• Privileged Identity Management (PIM), app registrations, enterprise apps (new at fundamentals level)
• Oversharing detection — SharePoint data access governance reports and restricted site access
• Researcher and Analyst use cases — new Copilot archetypes

Which Renews and Which Does Not

This is a common misconception worth pinning down: AB-900 does NOT expire. It is a Fundamentals-level credential, and Microsoft's certification renewal policy explicitly carves Fundamentals out — "Fundamentals certifications do not expire." Annual free-renewal assessments apply only to associate, expert, and specialty certs. AB-900 once earned stays on your transcript forever, exactly like MS-900 before it.

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The 2026 Study Pathway (If You Want an M365 Fundamentals Credential)

Here is the cleanest 2026 plan for a candidate who wanted MS-900 but is reading this after retirement.

Week 1 — Microsoft 365 Apps and Services

• Work through the MS-900 Microsoft Learn learning path for apps and services (still published, still valid for learning)
• Focus: Teams, SharePoint, OneDrive, Exchange, Intune, Viva, Copilot overview, admin centers, Windows 365 vs AVD
• Practice: 30 questions from our free MS-900 practice bank

Week 2 — Security, Compliance, Privacy, and Trust

• Microsoft Learn: Entra ID fundamentals, Defender XDR, Purview basics, Zero Trust
• Focus: MFA, SSPR, conditional access, Defender portal, sensitivity labels, DLP, eDiscovery
• Practice: 30 questions on Skill 3 from our free practice bank

Week 3 — Cloud Concepts + Pricing/Licensing/Support

• Microsoft Learn: SaaS vs PaaS vs IaaS, public/private/hybrid cloud, M365 SKUs, EA vs CSP vs Web Direct, license add-ons, SLAs, support tiers
• This week is the fastest: both domains combined are only 15-25% of the old MS-900 and map directly to AB-900
• Practice: 25 questions on Skills 1 and 4

Week 4 — AB-900-Specific Topics

• Switch to AB-900 content: Purview DSPM for AI, Copilot data grounding via Microsoft Graph, agent lifecycle, PIM, app registrations, oversharing governance, Researcher/Analyst agents, Copilot licensing (monthly vs PAYG)
• Take the AB-900 practice assessment on Microsoft Learn
• Schedule the AB-900 exam

That is a realistic 4-week path for a Microsoft 365 user who wants the current fundamentals credential. Most candidates report 30-50 hours of total study.

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Common Mistakes That Trip Up Legacy MS-900 Study Material Users

Mistake #1: Studying MS-900 Dumps in April 2026

If you find a "MS-900 dump" or "latest MS-900 questions" site in 2026, understand: those questions can no longer be used to earn a credential. The exam does not exist anymore. Either use the content as a learning aid or pivot to AB-900 material.

Mistake #2: Assuming AB-900 Is MS-900 with Copilot Added

AB-900 is not MS-900 with a Copilot chapter bolted on. It reframes the entire fundamentals curriculum around data protection, governance, and administration of an AI-powered Microsoft 365 environment. ~75% of the content is new or substantially deeper than MS-900 covered.

Mistake #3: Not Recognizing That Your MS-900 Credential Still Matters

Retirement of an exam does not invalidate the credential. If you passed MS-900 before March 31, 2026, it stays on your Microsoft Learn transcript and Credly profile forever. Keep it listed on LinkedIn. Keep it on your resume.

Mistake #4: Confusing Microsoft 365 and Office 365

The single most-tested MS-900 distinction is still relevant on AB-900 and in day-to-day M365 work: Office 365 = productivity apps (Word, Excel, PowerPoint, Teams, Exchange). Microsoft 365 = Office 365 + Windows + Enterprise Mobility + Security. Always pick the broader bundle when the scenario involves devices, security, or identity.

Mistake #5: Ignoring Microsoft Entra Rename

Microsoft renamed Azure Active Directory to Microsoft Entra ID in 2023. Any study content that still calls it Azure AD is at least three years out of date. Both MS-900 (final version) and AB-900 use the Entra ID naming.

Mistake #6: Confusing Windows 365 and Azure Virtual Desktop

• Windows 365 Cloud PC — per-user, single-session, fixed monthly price, simpler to administer, targeted at business users who need a reliable cloud desktop
• Azure Virtual Desktop (AVD) — multi-session, consumption-priced, more flexible, more admin work, targeted at variable workloads

This distinction appeared repeatedly on MS-900 and carries forward to AB-900.

Mistake #7: Treating Copilot as a Single Product

On the current exam outline, "Copilot" breaks into multiple discrete products: Microsoft 365 Copilot, Microsoft 365 Copilot Chat, Copilot Studio (build agents), Researcher and Analyst (specialized agents), and custom agents. Each has its own use cases and licensing.

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Career Paths After MS-900 (or AB-900)

MS-900 alone — and AB-900 alone — is a beginner credential. The career leverage comes from stacking it with a role-based associate cert within 12-18 months.

The Microsoft 365 Admin Ladder

Entry-Level Roles MS-900 or AB-900 Helps Land

Realistic 24-month path: AB-900 now → help desk or junior M365 admin role within 3-6 months → MS-102 within 12 months → mid-senior M365 admin, security admin, or Entra admin role at $110,000+ within 18-24 months.

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Recommended FREE Resources

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Test-Day Strategy (for AB-900, Using MS-900 Lessons)

The Pearson VUE testing engine is unchanged, so every MS-900 test-day lesson transfers directly to AB-900.

Pacing

• AB-900 runs 45 minutes with 40-60 questions — same pacing constraint as MS-900
• 45-65 seconds per question — no time to reread long passages
• Flag slow questions and return to them in the last 10 minutes

Microsoft Question Archetypes (Unchanged)

OnVUE Proctoring Setup

• Quiet, closable room — no one else present
• Clear desk — no papers, phones, books, second monitor
• Government ID ready
• Close Teams, Slack, and every unneeded browser tab
• Test webcam + mic 30 minutes before start
• Do NOT speak aloud during the exam — OnVUE flags that behavior

The Elimination Engine

1. Eliminate wrong-product answers first. External-facing site = Power Pages, not Power Apps. Endpoint management = Intune, not Purview. Cross-product threat correlation = Defender XDR.
2. Eliminate deprecated names. Azure AD → Microsoft Entra ID. Azure Information Protection → Microsoft Purview Information Protection. Microsoft Cloud App Security → Defender for Cloud Apps. New names are always correct.
3. Pick the Microsoft-recommended managed service when genuinely unsure — "Microsoft 365 + Purview + Defender" beats "custom solution" nearly every time on fundamentals exams.

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Final CTA: Start Practicing Today

MS-900 is retired. AB-900 is the current path. But the underlying Microsoft 365 knowledge — cloud concepts, M365 apps and services, security/compliance, pricing and licensing — is exactly as valuable in 2026 as it was in 2020. The candidates who lose time in April 2026 are the ones who abandon MS-900 material entirely instead of using it as the foundation it still is.

Start practicing nowFree exam prep with practice questions & AI tutor

The AI-era Microsoft 365 credential is AB-900. The AI-era Microsoft 365 knowledge base is still, largely, what MS-900 validated. Use the free resources, stack a role-based cert within 12-18 months, and you will have a genuinely durable Microsoft cloud career in front of you.

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Official Sources

• Microsoft 365 Certified: Fundamentals (retired): https://learn.microsoft.com/en-us/credentials/certifications/microsoft-365-fundamentals/
• MS-900 study guide (final, April 30, 2025): https://learn.microsoft.com/en-us/credentials/certifications/resources/study-guides/ms-900
• AB-900 study guide: https://learn.microsoft.com/en-us/credentials/certifications/resources/study-guides/ab-900
• AB-900 certification page: https://learn.microsoft.com/en-us/credentials/certifications/copilot-and-agent-administration-fundamentals/
• Microsoft 2026 certifications refresh announcement: https://techcommunity.microsoft.com/blog/skills-hub-blog/certifications-refresh-ai-focused-and-fundamentals-updates/4446638
• Microsoft credential expiration policy: https://learn.microsoft.com/en-us/credentials/support/credential-expiration-policy
• Microsoft exam retake policy: https://learn.microsoft.com/en-us/credentials/support/retake-policy
• Microsoft 365 Developer Program: https://developer.microsoft.com/microsoft-365/dev-program

Information current as of April 2026. MS-900 is retired; the successor credential is AB-900. Verify specific fees and skills-measured details at learn.microsoft.com before scheduling any current Microsoft exam.