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A company currently has Microsoft 365 E3 licenses for all 200 users. They need to add PSTN calling capabilities (Phone System and Calling Plan) for making and receiving external phone calls from Microsoft Teams. They also want to allow dial-in audio conferencing for online meetings. They want to minimize additional costs while keeping existing E3 subscriptions. What is the most cost-effective licensing strategy?

Question 1easymultiple choice
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A company currently has Microsoft 365 E3 licenses for all 200 users. They need to add PSTN calling capabilities (Phone System and Calling Plan) for making and receiving external phone calls from Microsoft Teams. They also want to allow dial-in audio conferencing for online meetings. They want to minimize additional costs while keeping existing E3 subscriptions. What is the most cost-effective licensing strategy?

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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

Distractor review

Purchase Microsoft 365 E5 add-on for each user

The E5 add-on provides many additional security and compliance features not required, making it more expensive than the targeted add-on.

B

Distractor review

Purchase Phone System add-on and Audio Conferencing add-on separately for each user

Buying two separate add-ons is more expensive than purchasing the combined 'Phone System + Audio Conferencing' add-on.

C

Best answer

Purchase the 'Phone System + Audio Conferencing' add-on for each user

This combined add-on includes both Phone System and Audio Conferencing at a lower cost than purchasing individually.

D

Distractor review

Upgrade all users to Microsoft 365 E5

Upgrading to E5 is a full license upgrade, which is significantly more expensive than adding the targeted add-on to existing E3 licenses.

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

Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.

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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: Purchase the 'Phone System + Audio Conferencing' add-on for each user — For organizations with Microsoft 365 E3, the best way to add Phone System, a Calling Plan, and Audio Conferencing is to purchase the 'Phone System + Audio Conferencing' add-on for each user. This single add-on provides both capabilities. Purchasing separately would be more expensive, and E5 add-on includes many features not needed at a higher cost.

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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