MS-900 Practice Question: Describe Microsoft 365 pricing, licensing, and support
Your company has 50 users on Microsoft 365 Business Premium. You need to provide phone system and audio conferencing capabilities. What should you do?
⚠ Common exam trap
Watch out — candidates often confuse the need for a Calling Plan with the Phone System and Audio Conferencing capabilities, or they mistakenly think Business Voice is still available, when in fact the correct path is to add the Phone System and Audio Conferencing add-ons to the existing Business Premium licenses.
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
✓
Add the Phone System and Audio Conferencing add-ons to the existing Business Premium licenses
Microsoft 365 Business Premium includes the rights to add Phone System and Audio Conferencing as add-ons. Option D is correct because you simply purchase the Phone System and Audio Conferencing add-on licenses for each user who needs those capabilities, without changing the base subscription. This is the most cost-effective and straightforward path to enable PSTN calling and dial-in conferencing for Business Premium users.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Purchase Microsoft 365 Business Voice
Why it's wrong here
Microsoft 365 Business Voice was a legacy add-on bundle for Business Premium that bundled Phone System, Audio Conferencing, and a Calling Plan, but Microsoft retired it from new purchases in 2022. Even if it were available, purchasing this bundle would force you to pay for Calling Plan minutes you do not need rather than simply adding the two specific components required.
- ✗
Purchase a Microsoft 365 Calling Plan subscription for each user
Why it's wrong here
A Microsoft 365 Calling Plan only supplies domestic or international PSTN minutes for inbound and outbound calls; it does not include the cloud PBX functionality of Phone System, such as call routing, auto attendant, or caller ID features. Because a Calling Plan is a nested add-on that requires Phone System to be present, assigning it to Business Premium users without Phone System would violate the licensing dependency and simply fail to enable calling.
- ✗
Upgrade all users to Microsoft 365 E5
Why it's wrong here
Upgrading all users to Microsoft 365 E5 would technically provide Phone System and Audio Conferencing because those features are included in that SKU. However, E5 is a far broader and more expensive license that bundles advanced security, analytics, and compliance tools that the organization does not need here, making it wasteful to upgrade 50 Business Premium users just to obtain two capabilities that are available as cheap per-user add-ons.
- ✓
Add the Phone System and Audio Conferencing add-ons to the existing Business Premium licenses
Why this is correct
For Microsoft 365 Business Premium, Phone System and Audio Conferencing are first-party per-user add-ons that can be directly attached to the tenant's existing base licenses. Phone System supplies the cloud PBX features for call control and routing, while Audio Conferencing enables external dial-in to Teams meetings, together satisfying the stated requirement without changing the base SKU or requiring any minimum seat upgrade.
Go deeper
Related to this question
Learn chapter
M365 Business Basic, Standard, Premium vs E3/E5
Key term
Subscription
A subscription is a payment model where you pay a recurring fee to access a product or service instead of buying it once and owning it forever.
Key term
User
A user is any person, system, or device that interacts with an IT service, resource, or identity system, typically authenticated through credentials and authorized to perform specific actions.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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