- A
Microsoft 365 E5 Security
Microsoft 365 E5 Security is an add-on for E3 that includes advanced security features such as Microsoft 365 Defender, Defender for Microsoft 365 Plan 2, Defender for Identity, and more, providing the highest threat protection and investigation.
- B
Microsoft 365 E5 Compliance
Why wrong: Microsoft 365 E5 Compliance add-on focuses on compliance capabilities like eDiscovery, records management, and insider risk management, not the advanced security threat protection requested.
- C
Microsoft 365 E5
Why wrong: Microsoft 365 E5 is a full product suite, not an add-on. While it includes the desired security, purchasing a full E5 license for users who already have E3 would be redundant and more expensive than the add-on.
- D
Microsoft Defender for Microsoft 365 Plan 2 only
Why wrong: Defender for Microsoft 365 Plan 2 protects email and collaboration, but the scenario requires advanced investigation across multiple domains, which is provided by the broader Microsoft 365 Defender suite in E5 Security.
MS-900 Describe Microsoft 365 pricing and support Practice Question
This MS-900 practice question tests your understanding of describe microsoft 365 pricing and support. 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 company with 500 Microsoft 365 E3 users wants to add the highest level of threat protection and advanced investigation capabilities for their security team. Which licensing add-on should they purchase?
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 365 E5 Security
Microsoft 365 E5 Security is the correct add-on because it bundles the highest level of threat protection (Microsoft Defender for Office 365 Plan 2, Microsoft Defender for Endpoint Plan 2, and Microsoft Defender for Identity) along with advanced investigation capabilities like automated investigation and response (AIR), threat analytics, and advanced hunting in Microsoft 365 Defender. This meets the requirement for top-tier threat protection and advanced investigation without upgrading the entire E3 base license to E5.
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 365 E5 Security
Why this is correct
Microsoft 365 E5 Security is an add-on for E3 that includes advanced security features such as Microsoft 365 Defender, Defender for Microsoft 365 Plan 2, Defender for Identity, and more, providing the highest threat protection and investigation.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Microsoft 365 E5 Compliance
Why it's wrong here
Microsoft 365 E5 Compliance add-on focuses on compliance capabilities like eDiscovery, records management, and insider risk management, not the advanced security threat protection requested.
- ✗
Microsoft 365 E5
Why it's wrong here
Microsoft 365 E5 is a full product suite, not an add-on. While it includes the desired security, purchasing a full E5 license for users who already have E3 would be redundant and more expensive than the add-on.
- ✗
Microsoft Defender for Microsoft 365 Plan 2 only
Why it's wrong here
Defender for Microsoft 365 Plan 2 protects email and collaboration, but the scenario requires advanced investigation across multiple domains, which is provided by the broader Microsoft 365 Defender suite in E5 Security.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse 'Microsoft 365 E5' (a full suite upgrade) with 'Microsoft 365 E5 Security' (an add-on), or they assume that Defender for Office 365 Plan 2 alone provides all advanced investigation features, when in fact E5 Security bundles multiple Defender plans and advanced hunting tools.
Trap categories for this question
Scenario analysis trap
Defender for Microsoft 365 Plan 2 protects email and collaboration, but the scenario requires advanced investigation across multiple domains, which is provided by the broader Microsoft 365 Defender suite in E5 Security.
Detailed technical explanation
How to think about this question
Under the hood, Microsoft 365 E5 Security integrates multiple Defender products into a unified incident response workflow via the Microsoft 365 Defender portal, enabling cross-domain advanced hunting using Kusto Query Language (KQL) across signals from endpoints, identities, email, and SaaS apps. In a real-world scenario, a security team using E5 Security can automatically correlate a phishing email with a compromised endpoint and an anomalous identity sign-in, then trigger automated remediation—capabilities not available with Defender for Office 365 Plan 2 alone.
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
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FAQ
Questions learners often ask
What does this MS-900 question test?
Describe Microsoft 365 pricing and support — This question tests Describe Microsoft 365 pricing and support — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Microsoft 365 E5 Security — Microsoft 365 E5 Security is the correct add-on because it bundles the highest level of threat protection (Microsoft Defender for Office 365 Plan 2, Microsoft Defender for Endpoint Plan 2, and Microsoft Defender for Identity) along with advanced investigation capabilities like automated investigation and response (AIR), threat analytics, and advanced hunting in Microsoft 365 Defender. This meets the requirement for top-tier threat protection and advanced investigation without upgrading the entire E3 base license to E5.
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 11, 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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