This MS-900 practice question tests your understanding of describe microsoft 365 apps and services. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
Your organization is migrating from on-premises Exchange to Exchange Online. You need to ensure that users can access their mailboxes using Outlook for Windows without re-entering credentials each time. Which Microsoft 365 service should you configure to enable single sign-on (SSO) and modern authentication?
Microsoft Entra ID
Provides identity and access management, including SSO and modern auth.
Microsoft Intune
Why wrong: Manages devices, not identity.
Microsoft Purview
Why wrong: Compliance and data governance, not authentication.
Microsoft Sentinel
Why wrong: Security information and event management, not authentication.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Microsoft Entra ID
Microsoft Entra ID (formerly Azure AD) is the identity and access management service that provides single sign-on (SSO) and modern authentication (OAuth 2.0, OpenID Connect) for Exchange Online. When configured, Outlook for Windows can use the Microsoft Entra ID token to authenticate silently, eliminating the need for users to re-enter credentials each time they access their mailbox.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Microsoft Entra ID
Why this is correct
Provides identity and access management, including SSO and modern auth.
Related concept
Read the scenario before looking for a memorised answer.
Microsoft Intune
Why it's wrong here
Manages devices, not identity.
Microsoft Purview
Why it's wrong here
Compliance and data governance, not authentication.
Microsoft Sentinel
Why it's wrong here
Security information and event management, not authentication.
Common exam traps
The trap here is that candidates confuse Microsoft Intune (device management) with identity services, or assume that any Microsoft 365 security or management tool can enable SSO, when only the identity provider (Microsoft Entra ID) can issue authentication tokens for modern auth.
Detailed technical explanation
Modern authentication in Exchange Online relies on the OAuth 2.0 protocol, where Outlook for Windows requests an access token from Microsoft Entra ID. The token is cached by the Microsoft Authentication Library (MSAL), allowing subsequent mailbox connections without credential prompts. In a hybrid migration, you must configure the Exchange hybrid deployment to use OAuth authentication between on-premises and Exchange Online, which is often overlooked and can cause repeated credential prompts even after SSO is enabled.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
What to study next
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FAQ
Describe Microsoft 365 apps and services — This question tests Describe Microsoft 365 apps and services — Read the scenario before looking for a memorised answer..
The correct answer is: Microsoft Entra ID — Microsoft Entra ID (formerly Azure AD) is the identity and access management service that provides single sign-on (SSO) and modern authentication (OAuth 2.0, OpenID Connect) for Exchange Online. When configured, Outlook for Windows can use the Microsoft Entra ID token to authenticate silently, eliminating the need for users to re-enter credentials each time they access their mailbox.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 24, 2026
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