This MS-900 practice question tests your understanding of describe microsoft 365 apps and services. 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.
Which TWO Microsoft 365 services provide real-time communication and collaboration features?
OneDrive for Business
Why wrong: OneDrive is for file storage and sharing, not real-time communication.
Microsoft Teams
Teams provides real-time chat, meetings, and collaboration.
Exchange Online
Why wrong: Exchange is for email, not real-time collaboration.
Yammer
Yammer enables real-time social networking and discussions.
SharePoint
Why wrong: SharePoint is for document management, not real-time communication.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Microsoft Teams
Microsoft Teams (B) is correct because it provides real-time communication and collaboration features such as instant messaging, voice/video calls, and online meetings, all integrated within a single hub. Yammer (D) is correct because it offers enterprise social networking with real-time conversations, live events, and community-based collaboration, enabling immediate communication across an organization.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
OneDrive for Business
Why it's wrong here
OneDrive is for file storage and sharing, not real-time communication.
Microsoft Teams
Why this is correct
Teams provides real-time chat, meetings, and collaboration.
Related concept
Read the scenario before looking for a memorised answer.
Exchange Online
Why it's wrong here
Exchange is for email, not real-time collaboration.
Yammer
Why this is correct
Yammer enables real-time social networking and discussions.
Related concept
Read the scenario before looking for a memorised answer.
SharePoint
Why it's wrong here
SharePoint is for document management, not real-time communication.
Common exam traps
The trap here is that candidates often confuse OneDrive for Business or SharePoint as collaboration tools because they allow co-authoring, but they lack real-time communication features like chat or video, which are the core focus of this question.
Detailed technical explanation
Microsoft Teams uses the Microsoft Graph API and the Real-Time Transport Protocol (RTP) for audio/video streams, with signaling handled via Session Initiation Protocol (SIP) through Azure Communication Services. Yammer leverages a persistent, activity-feed-based architecture with WebSockets for real-time updates, enabling instant notifications and live event streaming. In a real-world scenario, Teams is used for daily stand-ups and ad-hoc huddles, while Yammer supports company-wide announcements with threaded discussions that update in real time without requiring a separate meeting.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A healthcare organisation deploys an application with a public-facing web tier and a private database tier. The database subnet has no public IP and only accepts connections from the web tier's security group. Questions like this test whether you can design cloud network isolation using VNets/VPCs, subnets, and security group rules.
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FAQ
Describe Microsoft 365 apps and services — This question tests Describe Microsoft 365 apps and services — Read the scenario before looking for a memorised answer..
The correct answer is: Microsoft Teams — Microsoft Teams (B) is correct because it provides real-time communication and collaboration features such as instant messaging, voice/video calls, and online meetings, all integrated within a single hub. Yammer (D) is correct because it offers enterprise social networking with real-time conversations, live events, and community-based collaboration, enabling immediate communication across an organization.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 24, 2026
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