- A
Microsoft Purview Double Key Encryption, Exchange Online Archiving, SharePoint Online, Microsoft Sentinel
Why wrong: Double Key Encryption is for specific scenarios, not general encryption; SharePoint requires manual setup for offline sync; Sentinel is a SIEM, not a unified threat response console for endpoints.
- B
Microsoft Purview Customer Key, Exchange Online Archiving, OneDrive, Microsoft Defender XDR
Correct: Customer Key for encryption, Exchange Online Archiving for 10-year retention, OneDrive for offline sync, Defender XDR for unified threat monitoring.
- C
Azure Information Protection, Exchange Online Archiving, Windows 365, Microsoft Defender for Endpoint
Why wrong: Azure Information Protection is for classification, not encryption; Windows 365 is a cloud PC, not offline file sync; Defender for Endpoint is only for endpoints, not email or identity.
- D
Microsoft Purview Customer Key, Exchange Online In-Place Hold, OneDrive, Microsoft 365 Defender for Cloud Apps
Why wrong: In-Place Hold is for litigation hold, not archiving for 10 years; Defender for Cloud Apps is for cloud apps, not endpoint or identity threats.
MS-900 Describe Microsoft 365 apps and services Practice Question
This MS-900 practice question tests your understanding of describe microsoft 365 apps and services. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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.
Contoso Ltd. is a global manufacturing company with 10,000 users. They are deploying Microsoft 365 E5 and require: (1) All Microsoft 365 data must be encrypted at rest and in transit using customer-managed keys; (2) Email must be archived for 10 years; (3) Users must be able to access files offline on mobile devices and sync changes when online; (4) The IT team must monitor and respond to threats across email, endpoints, and identities from a single console. You need to recommend the appropriate Microsoft 365 services. Which combination should you choose?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Microsoft Purview Customer Key, Exchange Online Archiving, OneDrive, Microsoft Defender XDR
Option B is correct because Microsoft Purview Customer Key provides customer-managed encryption keys for data at rest in Microsoft 365, meeting the first requirement. Exchange Online Archiving with a 10-year retention policy satisfies the email archiving requirement. OneDrive enables offline file access on mobile devices with sync capabilities. Microsoft Defender XDR (Extended Detection and Response) offers a unified console to monitor and respond to threats across email, endpoints, and identities.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Microsoft Purview Double Key Encryption, Exchange Online Archiving, SharePoint Online, Microsoft Sentinel
Why it's wrong here
Double Key Encryption is for specific scenarios, not general encryption; SharePoint requires manual setup for offline sync; Sentinel is a SIEM, not a unified threat response console for endpoints.
- ✓
Microsoft Purview Customer Key, Exchange Online Archiving, OneDrive, Microsoft Defender XDR
Why this is correct
Correct: Customer Key for encryption, Exchange Online Archiving for 10-year retention, OneDrive for offline sync, Defender XDR for unified threat monitoring.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Azure Information Protection, Exchange Online Archiving, Windows 365, Microsoft Defender for Endpoint
Why it's wrong here
Azure Information Protection is for classification, not encryption; Windows 365 is a cloud PC, not offline file sync; Defender for Endpoint is only for endpoints, not email or identity.
- ✗
Microsoft Purview Customer Key, Exchange Online In-Place Hold, OneDrive, Microsoft 365 Defender for Cloud Apps
Why it's wrong here
In-Place Hold is for litigation hold, not archiving for 10 years; Defender for Cloud Apps is for cloud apps, not endpoint or identity threats.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is confusing Microsoft Purview Customer Key (which encrypts all data at rest with customer-managed keys) with Double Key Encryption (which only protects a subset of data) or Azure Information Protection (which is a labeling solution, not encryption at rest).
Trap categories for this question
Scenario analysis trap
Double Key Encryption is for specific scenarios, not general encryption; SharePoint requires manual setup for offline sync; Sentinel is a SIEM, not a unified threat response console for endpoints.
Detailed technical explanation
How to think about this question
Microsoft Purview Customer Key uses a hierarchical key architecture with two tiers: a customer-managed root key (KEK) stored in Azure Key Vault, and a data encryption key (DEK) generated by Microsoft 365. The DEK is wrapped by the KEK, ensuring that Microsoft cannot access the underlying data without the customer key. For offline file access, OneDrive uses the Files On-Demand feature, which syncs file metadata and allows selective offline pinning, leveraging the Windows sync engine (OneDrive.exe) to reconcile changes when connectivity is restored.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
What to study next
Got this wrong? Here's your next step.
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FAQ
Questions learners often ask
What does this MS-900 question test?
Describe Microsoft 365 apps and services — This question tests Describe Microsoft 365 apps and services — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Microsoft Purview Customer Key, Exchange Online Archiving, OneDrive, Microsoft Defender XDR — Option B is correct because Microsoft Purview Customer Key provides customer-managed encryption keys for data at rest in Microsoft 365, meeting the first requirement. Exchange Online Archiving with a 10-year retention policy satisfies the email archiving requirement. OneDrive enables offline file access on mobile devices with sync capabilities. Microsoft Defender XDR (Extended Detection and Response) offers a unified console to monitor and respond to threats across email, endpoints, and identities.
What should I do if I get this MS-900 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
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Last reviewed: Jun 24, 2026
This MS-900 practice question is part of Courseiva's free Microsoft certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the MS-900 exam.
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