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

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Key Facts

  • Microsoft retired the MS-900 Microsoft 365 Fundamentals exam on March 31, 2026 per the official Microsoft Learn ILT communication on techcommunity.microsoft.com.
  • Candidates who passed MS-900 before retirement keep the credential permanently because Microsoft Fundamentals certifications do not expire per the Microsoft certification renewal page.
  • AB-900 Microsoft 365 Copilot and Agent Administration Fundamentals replaces MS-900 and launched in beta on November 13, 2025 with general availability in February 2026.
  • MS-900 final outline (April 2025) tested 4 domains: Microsoft 365 apps and services 45-50%, security/compliance/privacy/trust 25-30%, pricing/licensing/support 10-15%, cloud concepts 5-10%.
  • AB-900 tests 3 domains: core Microsoft 365 features and objects 30-35%, data protection and governance for Microsoft 365 and Copilot 35-40%, Copilot and agent administration 25-30%.
  • AB-900 runs 45 minutes and is proctored by Pearson VUE, currently offered only in English per the Microsoft Learn certification page as of April 2026.
  • AB-900 is Beginner/Fundamentals level, so it does NOT expire and requires no annual renewal per Microsoft's official certification renewal policy page.
  • Microsoft offered the first 300 AB-900 beta candidates 80% off market price using code AB900Goals26 before January 3, 2026 per the Microsoft Tech Community launch post.
  • AB-900 adds Purview DSPM for AI, Copilot monthly vs pay-as-you-go licensing, agent approval workflows, Researcher and Analyst use cases, and SharePoint Advanced Management beyond MS-900.
  • Roughly 20-25% of AB-900 content overlaps with MS-900 per Microsoft Learn community guidance, with most new content concentrated in the 35-40% data protection and governance domain.

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:

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.

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).

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 .