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.
A user receives a suspicious email with a link. They report it using the built-in Microsoft 365 reporting tool. Which service will analyze the reported message?
Microsoft Defender for Office 365
Defender for Office 365 analyzes reported phishing and malware in email.
Microsoft Sentinel
Why wrong: Sentinel is a SIEM for security events, not specialized email analysis.
Microsoft Purview
Why wrong: Purview is for compliance and data governance, not email security.
Microsoft Defender XDR
Why wrong: Defender XDR covers endpoints, identities, and cloud apps, but not primarily email.
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 for Office 365
Microsoft Defender for Office 365 (MDO) includes the built-in reporting tool that allows users to report suspicious emails directly from Outlook. When a user submits a message via this tool, it is automatically routed to the Microsoft 365 Defender portal's Submissions page, where it is analyzed by MDO's threat protection engines, including detonation in the sandbox environment for URLs and attachments. This analysis determines whether the message is malicious, spam, or a false positive, and updates the tenant's filtering policies accordingly.
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 Defender for Office 365
Why this is correct
Defender for Office 365 analyzes reported phishing and malware in email.
Related concept
Read the scenario before looking for a memorised answer.
Microsoft Sentinel
Why it's wrong here
Sentinel is a SIEM for security events, not specialized email analysis.
Microsoft Purview
Why it's wrong here
Purview is for compliance and data governance, not email security.
Microsoft Defender XDR
Why it's wrong here
Defender XDR covers endpoints, identities, and cloud apps, but not primarily email.
Common exam traps
The trap here is that candidates confuse Microsoft Defender for Office 365 (which handles email-specific threat analysis and user submissions) with Microsoft Defender XDR (which is the broader correlation engine that ingests alerts from Defender for Office 365 and other sources, but does not itself perform the initial analysis of user-reported messages).
Detailed technical explanation
Under the hood, when a user reports an email via the built-in button, the message is submitted to Microsoft's backend using the Exchange Online Submission API, which triggers an automated investigation in the Microsoft 365 Defender portal. The analysis includes URL detonation in a sandboxed browser environment (using the same technology as Safe Links), attachment detonation (Safe Attachments), and heuristic checks against the latest threat intelligence feeds. This process can also automatically update the tenant's block lists and trigger automated remediation actions like deleting the email from other users' inboxes if it is confirmed malicious.
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 for Office 365 — Microsoft Defender for Office 365 (MDO) includes the built-in reporting tool that allows users to report suspicious emails directly from Outlook. When a user submits a message via this tool, it is automatically routed to the Microsoft 365 Defender portal's Submissions page, where it is analyzed by MDO's threat protection engines, including detonation in the sandbox environment for URLs and attachments. This analysis determines whether the message is malicious, spam, or a false positive, and updates the tenant's filtering policies accordingly.
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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