The direct answer: AB-900 is the Microsoft 365 Certified: Copilot and Agent Administration Fundamentals certification. It validates that you can configure, secure, and govern Microsoft 365 Copilot and AI agents in an enterprise environment. It is the replacement for MS-900, which retired on March 31, 2026, and it costs $99, takes 45 minutes, and does not expire.
If you were planning to take MS-900, AB-900 is where you go now. If you are an IT administrator supporting a Microsoft 365 environment that is deploying Copilot, AB-900 directly validates what your role requires in 2026.
What Is AB-900?
AB-900 is the Microsoft 365 Certified: Copilot and Agent Administration Fundamentals certification. It is a fundamentals-level credential for IT professionals and administrators who need to understand how to deploy, configure, secure, and govern Microsoft 365 Copilot and AI agents across an organization.
Unlike most Microsoft fundamentals certifications which focus on product awareness, AB-900 is distinctly administration-focused. It tests practical knowledge of admin center navigation, security controls, data governance, Copilot licensing, and agent lifecycle management. Real-world experience with Microsoft 365 admin centers is strongly recommended.
AB-900 Exam at a Glance
| Detail | Information |
| Certification name | Microsoft 365 Certified: Copilot and Agent Administration Fundamentals |
| Exam code | AB-900 |
| Exam cost | $165 USD |
| Exam duration | 45 minutes |
| Number of questions | 40 to 60 |
| Passing score | 700 out of 1000 |
| Expiration | Does not expire (fundamentals certification) |
| Available languages | English (additional languages expected) |
| Generally available | February 2026 |
| Official course | AB-900T00-A: Introduction to Microsoft 365 and AI Administration |
| Replaces | MS-900 (Microsoft 365 Fundamentals) retired March 31, 2026 |
What Does AB-900 Cover?
AB-900 covers three main domains. The exam is wide in breadth but not deep in any single area. Experienced beta testers described it as the hardest fundamentals exam Microsoft has released, citing the scope spanning Microsoft 365 administration, security, data governance, Purview, Defender, Copilot management, and agent administration all within a single 45-minute exam.
AB-900 Exam Domains
| Domain | Weight | What You Do |
| Understand Microsoft 365 fundamentals and security | 30-35% | Microsoft 365 core services and objects, admin center navigation, Exchange Online, SharePoint, Teams, Microsoft Entra ID, Zero Trust principles, conditional access policies, SSO, Microsoft Defender XDR, authentication methods, MFA troubleshooting, Identity Secure Score |
| Understand data protection and governance for Microsoft 365 and Copilot | 35-40% | Microsoft Purview components including DLP, sensitivity labels, insider risk management, communication compliance, data lifecycle management, DSPM for AI, Microsoft Purview Compliance Manager, SharePoint Advanced Management, how Copilot uses permissions and controls to protect against risks, data governance for AI scenarios |
| Perform basic administrative tasks for Copilot and agents | 25-30% | Copilot licensing models including monthly and pay-as-you-go, enabling and disabling Copilot features, billing and usage monitoring, prompt governance, user adoption strategies, agent lifecycle management including creating, editing, testing, publishing, and approving agents, monitoring agent usage through Microsoft 365 admin center and Power Platform admin center |
The heaviest domain is data protection and governance at 35 to 40 percent. This surprises many candidates who expect Copilot administration to be the core focus. Real beta exam takers reported the exam leaned significantly more toward Microsoft Purview than toward Copilot features. Purview preparation is where most candidates need to invest the most study time.
Core admin centers tested: Microsoft 365 Admin Center, Microsoft Entra Admin Center, Microsoft Purview Compliance Portal, SharePoint Admin Center, and Power Platform Admin Center. You need to know what tasks belong in each center and how to navigate them efficiently.
Core tools and services tested: Microsoft Purview, Microsoft Defender XDR, Microsoft Entra ID, SharePoint Advanced Management, Copilot Studio (for agent administration), Microsoft 365 Copilot across all apps.
How AB-900 Compares to MS-900
MS-900 retired on March 31, 2026. It was the most widely recommended entry-level Microsoft 365 certification for IT professionals, business users, and anyone entering the Microsoft 365 ecosystem. AB-900 is its direct successor but with substantially expanded scope.
| Factor | MS-900 (Retired) | AB-900 (Current) |
| Status | Retired March 31, 2026 | Active, generally available February 2026 |
| Focus | Broad Microsoft 365 overview | Microsoft 365 administration with Copilot and agent governance |
| Exam cost | $99 USD | $165 USD |
| Duration | 60 minutes | 45 minutes |
| Questions | 40 to 60 | 40 to 60 |
| Expiration | Does not expire | Does not expire |
| Purview coverage | Basic | Deep, 35 to 40% of exam |
| Copilot coverage | Minimal | Dedicated administrative domain |
| Agent administration | Not covered | Core requirement |
| Defender XDR | Basic awareness | Tested in depth |
| Content volume | Broad and shallow | Broader and deeper across new AI administration areas |
| Difficulty vs MS-900 | Baseline | Harder, more breadth, more technical depth in places |
Your MS-900 content gives you approximately 30 to 35 percent of AB-900 preparation. Core Microsoft 365 services, identity fundamentals, and basic security concepts transfer. The entirely new content to study is Microsoft Purview governance, Copilot licensing and administration, and agent lifecycle management.
If you already earned MS-900 before March 31, 2026, your credential stays on your Microsoft Learn transcript permanently. MS-900 does not expire. You do not need to take AB-900 to keep your MS-900. But if your role involves managing Microsoft 365 Copilot deployments, AB-900 reflects the current state of your job far better than a credential that predates enterprise AI adoption.
Who Should Take AB-900?
AB-900 is the right certification for:
Microsoft 365 administrators. If your role involves managing Microsoft 365 environments, configuring user access, managing licenses, implementing security policies, or maintaining compliance settings, AB-900 directly validates the skills your role now requires. Copilot and agents are standard components of enterprise Microsoft 365 environments in 2026. An administrator who cannot govern them is behind the curve.
IT help desk and support professionals. Support teams that handle Microsoft 365 tickets are increasingly fielding questions about Copilot behavior, agent access, and data governance. AB-900 builds the foundational understanding that makes support more effective across AI-powered Microsoft 365 environments.
Professionals who were planning to take MS-900. MS-900 is gone. AB-900 is the replacement. If Microsoft 365 is your target platform, AB-900 is where you start your certification journey now.
Career starters entering Microsoft 365 administration. AB-900 is the clearest entry point into the Microsoft 365 certification path for professionals building toward MS-102, Microsoft 365 Administrator Expert, or the broader Microsoft security and compliance certification tracks.
Microsoft partners and consultants. Organizations deploying Microsoft 365 Copilot for clients need certified professionals who understand governance, data protection, and agent administration. AB-900 validates the foundational layer of that expertise.
AB-900 is NOT the right fit for:
Business users who want to use Copilot productively. AB-900 is an administration and governance exam, not a productivity exam. If you want to prove you can use Copilot in Word, Excel, and Teams effectively, AB-730 (AI Business Professional) is the right credential. See our AB-730 vs AB-731 guide for the full comparison.
Azure cloud infrastructure professionals. AB-900 focuses exclusively on Microsoft 365. It does not cover Azure AI services, Azure OpenAI, or any Azure infrastructure. AZ-900 (Azure Fundamentals) is the entry-level credential for Azure-focused professionals.
AI engineers and developers. AB-900 is administration, not development. If your work involves building AI applications, working with Azure OpenAI, or developing agents through Copilot Studio from a developer perspective, AI-901 or AI-103 are the more relevant entry points.
AB-900 vs AI-901: Which Should You Take?
These two certifications share similar naming but target completely different audiences. This comparison is one of the most common sources of confusion in the 2026 Microsoft certification landscape.
| Factor | AB-900 | AI-901 |
| Full name | Microsoft 365 Copilot and Agent Administration Fundamentals | Azure AI Fundamentals (Refreshed) |
| Platform | Microsoft 365 | Azure |
| Primary audience | IT administrators and Microsoft 365 professionals | AI beginners, developers, data scientists, career changers |
| Replaces | MS-900 (Microsoft 365 Fundamentals) | AI-900 (Azure AI Fundamentals, retiring June 30, 2026) |
| Core content | M365 admin, Purview governance, Copilot admin, agent management | AI concepts, machine learning, Azure AI services, generative AI, Responsible AI |
| Coding required | No | No |
| Expiration | Does not expire | Does not expire |
| Cost | $165 USD | $165 USD |
| Best for | M365 administrators and IT support professionals | Anyone beginning an AI or Azure career path |
Take AB-900 if your role is Microsoft 365 administration, IT support, or security and compliance in a Microsoft 365 environment.
Take AI-901 if you are exploring AI concepts, beginning an Azure career, or want a broad understanding of artificial intelligence and Azure AI services.
Many professionals eventually pursue both as complementary credentials covering different dimensions of Microsoft’s technology landscape.
The Critical Difference Between AB-900 and AB-730
This is the second most common confusion point. Both certifications involve Microsoft 365 Copilot. They cover it from completely opposite perspectives.
| Factor | AB-900 | AB-730 |
| Copilot perspective | Administrator and governance | End user and productivity |
| Who | IT administrators who manage Copilot | Business users who use Copilot daily |
| What you prove | You can configure, secure, and govern Copilot | You can use Copilot effectively in Word, Excel, Teams |
| Purview | Core domain | Not covered |
| Agent administration | Core domain | Covered as a basic user capability |
| Cost | $165 USD | $99 USD |
| Expiration | Does not expire | Requires annual renewal |
AB-900 is for the person who deploys and governs Copilot. AB-730 is for the person who uses it. In an organization deploying Microsoft 365 Copilot, both certifications address real and distinct roles.
Where AB-900 Fits in the Microsoft Certification Path
AB-900 is the entry point for the Microsoft 365 administration and AI governance certification path. Understanding where it leads helps you plan your certification roadmap beyond this first credential.
| Level | Certification | What It Validates |
| Fundamentals | AB-900 | Microsoft 365 Copilot and agent administration fundamentals |
| Associate | MS-102 | Microsoft 365 Administrator |
| Associate | SC-300 | Microsoft Identity and Access Administrator |
| Associate | SC-400 | Microsoft Information Protection and Compliance Administrator |
| Associate | MS-700 | Managing Microsoft Teams |
| Expert | MS-102 + SC-300 combination | Microsoft 365 Enterprise Administrator Expert |
AB-900 is not a formal prerequisite for any of the above certifications. Microsoft does not require it before MS-102 or other role-based credentials. But candidates who have studied AB-900 find that its coverage of Microsoft Purview, Microsoft Entra, and Microsoft 365 admin center navigation significantly accelerates their preparation for the associate-level exams that build on those foundations.
For professionals interested in the Power Platform and AI business solutions path, AB-900 provides foundational Copilot context that complements AB-730, AB-731, and eventually AB-100. Our full Microsoft certifications retiring in 2026 guide covers how every current Microsoft certification track fits together.
Is AB-900 Worth It in 2026?
Yes, for the right professional.
The case for AB-900:
Microsoft 365 Copilot adoption in enterprise organizations is accelerating faster than administrator skill development. Organizations that deployed Copilot in 2024 and 2025 are now dealing with governance gaps, data exposure risks, agent sprawl, and compliance challenges that their IT teams were not prepared for. AB-900 validates the foundational skills that address exactly these challenges.
An IT administrator who holds AB-900 demonstrates to employers that they understand how to manage Copilot responsibly, not just use it. That distinction is increasingly valuable as organizations shift from Copilot pilots to enterprise-wide deployments that require real governance.
The honest caveats:
AB-900 is a fundamentals certification. It does not qualify you for advanced roles or command significant salary premiums on its own. Its primary value is as a foundation credential that signals current knowledge of AI-powered Microsoft 365 administration, demonstrates commitment to staying current with Microsoft’s AI certification path, and accelerates preparation for associate-level certifications that follow.
Salary context:
| Role | Average US Salary |
| Microsoft 365 Help Desk Specialist | $50,000 to $70,000 |
| Microsoft 365 Administrator (entry level) | $65,000 to $85,000 |
| Microsoft 365 Administrator (mid level with MS-102) | $85,000 to $110,000 |
| Copilot and AI Governance Specialist | $90,000 to $120,000 |
| Microsoft 365 Enterprise Administrator Expert | $110,000 to $145,000 |
AB-900 alone will not transform your salary. It is a stepping stone that signals directional competency and accelerates your path to the associate and expert credentials that do.
How to Prepare for AB-900
Step 1: Know the admin centers before anything else. AB-900 assumes you can navigate the five key Microsoft 365 admin centers: Microsoft 365 Admin Center, Microsoft Entra Admin Center, Microsoft Purview Compliance Portal, SharePoint Admin Center, and Power Platform Admin Center. If you are unfamiliar with any of these, set up a free Microsoft 365 developer tenant and spend time in each center before touching study materials.
Step 2: Invest heavily in Microsoft Purview preparation. Purview accounts for the largest portion of the exam at 35 to 40 percent. Beta candidates consistently reported being surprised by how much Purview appeared. Study the full Purview suite: Data Loss Prevention policies, sensitivity labels and their configuration, insider risk management policies, communication compliance, DSPM for AI, data lifecycle management, and Compliance Manager. This is the area where most candidates underestimate the required depth.
Step 3: Cover Microsoft Defender XDR. Most Microsoft 365 administrators do not interact with Defender XDR regularly because it is typically managed by security teams. AB-900 tests knowledge of what each Defender product does and how they relate to the broader Microsoft 365 security posture. Study the Defender XDR components, what they protect, and how they integrate with Microsoft 365.
Step 4: Study Copilot licensing and billing specifically. The Copilot administration domain covers content that is genuinely new even for experienced Microsoft 365 administrators. Study the Copilot licensing models including the monthly subscription model versus pay-as-you-go, how to enable and disable specific Copilot features across the tenant, how to monitor usage and adoption, and how billing works at the organizational level.
Step 5: Learn agent lifecycle management from an administrator perspective. AB-900 tests agent administration at a fundamentals level. Study how administrators create, edit, test, publish, and approve agents through the Power Platform admin center. Understand how to configure user access to agents and how to monitor agent usage. This content is new for most candidates and has limited preparation resources outside the official Microsoft Learn modules.
Step 6: Complete the official AB-900T00-A course on Microsoft Learn. The official instructor-led course Introduction to Microsoft 365 and AI Administration is designed for beginning-level IT professionals and novice administrators. It covers foundational Microsoft 365 concepts, Copilot administration, and AI-powered agent management. Complete every module and knowledge check. Use the exam sandbox to familiarize yourself with question formats.
Step 7: Build preparation around the official study guide. The AB-900 study guide on Microsoft Learn lists every skill measured with exact domain weightings. Every bullet point is a testable topic. Use it as a preparation checklist and confirm you have covered every item before booking your exam.
Recommended study timeline:
| Experience Level | Study Time Needed |
| No Microsoft 365 experience | 8 to 12 weeks at 1 hour per day |
| Familiar with Microsoft 365 basics | 4 to 6 weeks at 1 hour per day |
| Active Microsoft 365 administrator | 2 to 4 weeks focused on Purview and Copilot content |
| MS-900 holder or equivalent | 2 to 3 weeks focused on new Purview and Copilot domains |
Common Mistakes Candidates Make on AB-900
Underestimating Purview. The most consistent feedback from beta candidates is that Purview appears far more than expected. Candidates who prepare mostly for Copilot features and lightly skim Purview consistently report being caught off guard. Treat Purview as your primary study area.
Skipping Defender XDR. Many Microsoft 365 professionals have never directly worked with Defender XDR. Skipping it because it feels outside your daily role is the second most common preparation gap.
Treating it like MS-900. AB-900 is approximately double the content breadth of MS-900. Candidates who prepare assuming similar difficulty to MS-900 consistently find the exam harder than expected. Budget more time.
Ignoring agent administration. Agent lifecycle management through the Power Platform admin center is new content with limited community study resources. Do not skip it because materials are thin. Study the official Microsoft Learn modules specifically.
Frequently Asked Questions: AB-900 Certification
What is AB-900?
AB-900 is the Microsoft 365 Certified: Copilot and Agent Administration Fundamentals certification. It validates knowledge of Microsoft 365 administration, data protection and governance with Microsoft Purview, and Copilot and agent administration for IT professionals managing Microsoft 365 environments.
Is AB-900 the replacement for MS-900?
Yes. MS-900 (Microsoft 365 Fundamentals) retired on March 31, 2026. AB-900 is its official replacement. It covers the foundational Microsoft 365 administration knowledge from MS-900 and adds Microsoft Purview governance, Copilot administration, and agent lifecycle management.
Does AB-900 expire?
No. AB-900 is a fundamentals certification and does not expire. Once earned, it stays on your Microsoft Learn transcript permanently with no renewal requirement.
How much does AB-900 cost?
AB-900 costs $165 USD. Prices may vary by country or region. Verify current pricing on the Microsoft Learn exam page before booking.
How hard is AB-900?
AB-900 is harder than most Microsoft fundamentals certifications including MS-900 and AZ-900. Real beta exam candidates described it as the hardest fundamentals exam Microsoft has released due to the breadth of content spanning Microsoft 365 administration, Purview governance, Defender XDR, Copilot management, and agent administration all within 45 minutes.
What is the difference between AB-900 and AB-730?
AB-900 is for IT administrators who deploy, govern, and secure Microsoft 365 Copilot environments. AB-730 is for business users who use Copilot productively in daily work. AB-900 costs $165 and does not expire. AB-730 costs $99 and requires annual renewal.
What is the difference between AB-900 and AI-901?
AB-900 covers Microsoft 365 Copilot administration, Purview governance, and agent management for IT administrators. AI-901 covers Azure AI concepts, machine learning, and Azure AI services for anyone beginning an AI or Azure career. They are completely different certifications targeting different roles and platforms.
Can I still use my MS-900 certification?
Yes. MS-900 credentials earned before March 31, 2026 remain on your Microsoft Learn transcript permanently. MS-900 does not expire. You do not need to retake anything to keep your existing MS-900. AB-900 is a new and separate certification you would pursue additionally.
What jobs does AB-900 qualify me for?
AB-900 is a fundamentals credential that strengthens applications for Microsoft 365 Help Desk Specialist, IT Support Specialist, and junior Microsoft 365 Administrator roles. It is most valuable as a stepping stone toward associate-level certifications like MS-102 and SC-300 that directly qualify for higher-paying administration roles.
Is AB-900 good for IT beginners?
AB-900 is accessible for IT beginners but is not a true beginner exam in the way MS-900 was. Microsoft recommends familiarity with Microsoft 365 services, admin center navigation, and basic security concepts before attempting AB-900. Complete beginners without any Microsoft 365 exposure should budget 8 to 12 weeks for preparation.
Does AB-900 count toward AB-100?
No. AB-100 (Agentic AI Business Solutions Architect Expert) requires an active associate-level Microsoft certification as a prerequisite. AB-900 is a fundamentals certification and does not qualify as the prerequisite. Associate-level credentials like AB-730, AB-731, or PL-400 are needed for AB-100 eligibility.
How is AB-900 different from SC-900?
SC-900 (Security, Compliance, and Identity Fundamentals) covers foundational security, compliance, and identity concepts across both Microsoft 365 and Azure. AB-900 is focused specifically on Microsoft 365 administration with Copilot and agent governance. There is meaningful overlap in Microsoft Purview and Microsoft Entra content. Many candidates who hold SC-900 find a portion of AB-900 familiar.
