- A
Microsoft 365 E5 Security
Correct. The E5 Security add-on provides Microsoft 365 Defender for advanced threat hunting across multiple domains and includes automated endpoint isolation.
- B
Microsoft 365 E5
Why wrong: Incorrect. Upgrading to full E5 is more expensive than the Security add-on and includes many features (e.g., advanced compliance) not required for this scenario.
- C
Microsoft 365 E5 Compliance
Why wrong: Incorrect. The Compliance add-on focuses on eDiscovery, retention, and data governance, not threat hunting or endpoint security.
- D
Enterprise Mobility + Security (EMS) E5
Why wrong: Incorrect. EMS E5 is an older bundle that includes Microsoft Entra ID P2 and Intune but does not include Microsoft 365 Defender for threat hunting. It is no longer the recommended add-on for this purpose.
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 multinational organization with 500 users currently has Microsoft 365 E3 licenses. They need to perform advanced threat hunting using queries across email, endpoints, and identities to investigate a security incident. They also need the ability to automatically isolate infected endpoints. What is the most cost-effective licensing addition?
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 most cost-effective addition because it provides advanced threat hunting via Microsoft 365 Defender (including queries across email, endpoints, and identities) and automated endpoint isolation through Microsoft Defender for Endpoint. This add-on delivers the required capabilities without the full cost of upgrading all users to Microsoft 365 E5, which would also include unnecessary features like advanced compliance and analytics.
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
Correct. The E5 Security add-on provides Microsoft 365 Defender for advanced threat hunting across multiple domains and includes automated endpoint isolation.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Microsoft 365 E5
Why it's wrong here
Incorrect. Upgrading to full E5 is more expensive than the Security add-on and includes many features (e.g., advanced compliance) not required for this scenario.
- ✗
Microsoft 365 E5 Compliance
Why it's wrong here
Incorrect. The Compliance add-on focuses on eDiscovery, retention, and data governance, not threat hunting or endpoint security.
- ✗
Enterprise Mobility + Security (EMS) E5
Why it's wrong here
Incorrect. EMS E5 is an older bundle that includes Microsoft Entra ID P2 and Intune but does not include Microsoft 365 Defender for threat hunting. It is no longer the recommended add-on for this purpose.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse Microsoft 365 E5 Security with the full Microsoft 365 E5 license, assuming the full E5 is required for security features, when in fact the Security add-on provides the specific threat hunting and isolation capabilities at a lower cost.
Trap categories for this question
Scenario analysis trap
Incorrect. Upgrading to full E5 is more expensive than the Security add-on and includes many features (e.g., advanced compliance) not required for this scenario.
Detailed technical explanation
How to think about this question
Advanced threat hunting in Microsoft 365 Defender uses Kusto Query Language (KQL) to query data from email (Exchange Online Protection), endpoints (Microsoft Defender for Endpoint), and identities (Azure AD Identity Protection). Automated endpoint isolation leverages Microsoft Defender for Endpoint's response actions, which use the Windows Defender Antivirus engine and cloud-delivered protection to quarantine devices from the network while allowing forensic analysis. This capability is not available in EMS E5, which lacks the endpoint detection and response (EDR) components.
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 startup's cloud architect reviews their monthly bill and notices costs are higher than expected for a long-running batch job. Switching from on-demand instances to Reserved Instances — or using Spot/Preemptible VMs — can reduce compute costs by up to 72 %. Questions like this test whether you understand the tradeoffs between commitment, flexibility, and cost across cloud pricing models.
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 most cost-effective addition because it provides advanced threat hunting via Microsoft 365 Defender (including queries across email, endpoints, and identities) and automated endpoint isolation through Microsoft Defender for Endpoint. This add-on delivers the required capabilities without the full cost of upgrading all users to Microsoft 365 E5, which would also include unnecessary features like advanced compliance and analytics.
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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