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A company with 1,000 users currently has Microsoft 365 E3 licenses. They need to add advanced threat protection for email (including anti-phishing and anti-malware) and endpoint detection and response (EDR) for all devices. What is the most cost-effective licensing addition?

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A company with 1,000 users currently has Microsoft 365 E3 licenses. They need to add advanced threat protection for email (including anti-phishing and anti-malware) and endpoint detection and response (EDR) for all devices. What is the most cost-effective licensing addition?

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Answer choices

Why each option matters

Good practice is not just finding the correct option. The wrong answers often show the exact trap the exam wants you to fall into.

A

Best answer

Microsoft 365 E5 Security add-on

Correct. This add-on bundles Defender for Microsoft 365 Plan 2 and Defender for Endpoint Plan 2, providing the needed capabilities at a lower cost than other options.

B

Distractor review

Microsoft 365 E5 Compliance add-on

This add-on provides compliance features like eDiscovery and Auditing, not the advanced threat protection and EDR required.

C

Distractor review

Upgrade all users to Microsoft 365 E5

Upgrading to E5 adds many extra features (e.g., advanced compliance, analytics) that are not needed, making it more expensive than the Security add-on.

D

Distractor review

Microsoft Defender for Microsoft 365 Plan 1 standalone

This provides only basic email protection, not the full anti-phishing/anti-malware required, and does not include EDR.

Common exam trap

Common exam trap: answer the scenario, not the keyword

Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.

Technical deep dive

How to think about this question

This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.

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.
  • Use explanations to understand the rule behind the answer.

TExam Day Tips

  • Underline the problem statement mentally.
  • 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.

Related practice questions

Related MS-900 practice-question pages

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More questions from this exam

Keep practising from the same exam bank, or move into a focused topic page if this question exposed a weak area.

Question 1

During requirements gathering, an IT manager says the organization must let users provision resources from a portal without provider interaction. Cloud concept or benefit best matches this requirement?

Question 2

A compliance-aware administrator is selecting the right Microsoft 365 capability to use Microsoft 365 and another public cloud provider for different workloads. Cloud concept or benefit best matches this requirement?

Question 3

While preparing a Microsoft 365 adoption plan, a consultant is asked to manage leads, opportunities, customer accounts, and sales processes. Microsoft 365 app or service is the best fit?

Question 4

A project manager needs to create a detailed project schedule with a Gantt chart view, task dependencies, critical path analysis, and milestones. The schedule must be shared with team members who can update their tasks, and the manager wants to track progress against a baseline. Which Microsoft 365 app is specifically designed for this type of project management?

Question 5

A project manager wants to schedule a meeting with team members to discuss project progress. They need to find a time that works for everyone based on their calendars. Which Microsoft 365 app should they use?

Question 6

A project manager wants to create a visual dashboard that tracks project tasks, deadlines, and progress. The dashboard should pull data from a Microsoft List and update in real time. Which Microsoft 365 app is best suited for building this interactive dashboard?

FAQ

Questions learners often ask

What does this MS-900 question test?

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 add-on — The Microsoft 365 E5 Security add-on provides Defender for Microsoft 365 Plan 2 (advanced threat protection for email) and Defender for Endpoint Plan 2 (EDR). This is more cost-effective than upgrading all users to E5 or purchasing E5 Compliance, which includes additional compliance features not needed. Purchasing standalone plans separately would also be more expensive than the bundled Security add-on.

What should I do if I get this MS-900 question wrong?

Then try more questions from the same exam bank and focus on understanding why the wrong options are tempting.

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