This MS-900 practice question tests your understanding of describe microsoft 365 apps and services. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 company has deployed Microsoft Defender XDR. A security analyst needs to investigate a suspicious email that was reported by a user. Which Microsoft 365 service should the analyst use to view the email's details and analyze threats?
Microsoft Sentinel
Why wrong: SIEM, can be used but not the primary email investigation tool.
Microsoft Defender XDR
Unified security operations platform that includes email security.
Microsoft Intune
Why wrong: Device management.
Microsoft Purview
Why wrong: Compliance, not email threat investigation.
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 Defender XDR
Microsoft Defender XDR (Extended Detection and Response) is the correct service because it provides a unified investigation and response experience across email, endpoints, identities, and cloud apps. The security analyst can use the Microsoft Defender portal (security.microsoft.com) to view the full email details, including headers, attachments, URLs, and threat analysis results from automated investigation and advanced hunting queries.
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 Sentinel
Why it's wrong here
SIEM, can be used but not the primary email investigation tool.
Microsoft Defender XDR
Why this is correct
Unified security operations platform that includes email security.
Related concept
Read the scenario before looking for a memorised answer.
Microsoft Intune
Why it's wrong here
Device management.
Microsoft Purview
Why it's wrong here
Compliance, not email threat investigation.
Common exam traps
The trap here is that candidates often confuse Microsoft Sentinel (a SIEM) with Microsoft Defender XDR (an XDR solution), not realizing that email investigation is a core function of Defender for Office 365 within Defender XDR, not Sentinel.
Detailed technical explanation
Under the hood, Defender for Office 365 uses machine learning models and heuristics to analyze email headers, sender reputation, URL detonation, and attachment sandboxing. When a user reports a suspicious email via the Report Message add-in, the email is automatically submitted to the Microsoft 365 Defender portal, where the analyst can view the EmailEntity object in Advanced Hunting using the EmailEvents, EmailUrlInfo, and EmailAttachmentInfo tables. This integration allows the analyst to trace the email's journey and identify if it was part of a broader campaign.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
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 Defender XDR — Microsoft Defender XDR (Extended Detection and Response) is the correct service because it provides a unified investigation and response experience across email, endpoints, identities, and cloud apps. The security analyst can use the Microsoft Defender portal (security.microsoft.com) to view the full email details, including headers, attachments, URLs, and threat analysis results from automated investigation and advanced hunting queries.
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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