Microsoft 365 Fundamentals (MS-900) prep, adaptive plan with ARIA
MS-900 is Microsoft's beginner-tier Microsoft 365 Fundamentals cert. The exam runs 60 minutes, has roughly 40 to 60 questions, and you need 700 of 1000 to pass. It is concept-recognition only, with no admin tasks or labs. The credential is the right green-light Microsoft fundamentals signal for IT admins, helpdesk staff, sales engineers, and anyone working in a Microsoft 365 estate. It pairs cleanly with AZ-900 to cover the broader Microsoft cloud surface. The cert is permanent, with no renewal.
What the exam is
| Domain | Weight |
|---|---|
| Describe cloud concepts | 5-10% |
| Describe Microsoft 365 apps and services | 35-40% |
| Describe security, compliance, privacy, trust in Microsoft 365 | 25-30% |
| Describe Microsoft 365 pricing, licensing, support | 25-30% |
How 
ARIA preps you for it
The CAT eval lands a per-domain skill estimate before any plan is written. Most candidates land heavy on Pricing and Licensing, because the SKU naming (Business Basic, Business Standard, Business Premium, E1, E3, E5, F1, F3) catches anyone who has not personally compared SKUs in a procurement scenario. I weight the roadmap to your gaps, not to a generic chapter list. Your error backlog gets tagged by service area (Exchange, SharePoint, Teams, Intune, Defender, Purview, Entra ID), so spaced repetition surfaces the right thing on the right day.
Common pitfalls
- Memorizing SKUs without scenario context. The exam tests "which SKU fits this organization", not "what does E5 include". Practice the choice, not the recall.
- Skipping Compliance and Purview. It is a vocabulary-heavy section worth 25 to 30 percent. Read the chapter, do not skip.
- Confusing Entra ID with on-prem AD. Entra ID (formerly Azure AD) is a different product with different concepts. Several questions hinge on the distinction.
Why MS-900 is worth taking
MS-900 opens MS-102 (Microsoft 365 admin), SC-900 (security and compliance fundamentals), and the broader Microsoft 365 admin tracks. The time investment is small (about 20 to 25 hours from zero), and the credential is recognized across the industry.
Pass guarantee
Same five conditions as every ClaudeLab roadmap. Complete the plan, pass your mocks and gauntlet, hit readiness 80, sit the exam in the 60-day window, and you get a full refund if you do not pass.