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.
A company with Microsoft 365 E5 wants to use AI to summarize email threads and draft replies automatically. Which Microsoft 365 service provides this capability?
Microsoft Viva Insights
Why wrong: Viva Insights is for personal productivity insights.
Microsoft 365 Copilot
Copilot provides AI-assisted email summarization and drafting.
Microsoft Search
Why wrong: Search is for finding content.
Microsoft Editor
Why wrong: Editor is for writing assistance.
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 365 Copilot
Microsoft 365 Copilot integrates with Outlook and other Microsoft 365 apps to provide AI-powered email thread summarization and draft reply generation. It uses large language models (LLMs) combined with your Microsoft Graph data to understand context and produce relevant, personalized responses. This capability is not available in other Microsoft 365 services like Viva Insights or Microsoft Editor.
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.
Microsoft Viva Insights
Why it's wrong here
Viva Insights is for personal productivity insights.
Microsoft 365 Copilot
Why this is correct
Copilot provides AI-assisted email summarization and drafting.
Related concept
Read the scenario before looking for a memorised answer.
Microsoft Search
Why it's wrong here
Search is for finding content.
Microsoft Editor
Why it's wrong here
Editor is for writing assistance.
Common exam traps
The trap here is that candidates may confuse Microsoft Viva Insights (which provides 'insights' and 'suggestions' about work patterns) with AI-powered content generation, or assume Microsoft Editor's grammar suggestions include drafting capabilities, when in fact only Copilot uses generative AI for these tasks.
Detailed technical explanation
Microsoft 365 Copilot leverages the GPT-4 model from OpenAI, fine-tuned on Microsoft Graph data (emails, calendar, documents) to ground responses in user-specific context. When summarizing an email thread, it uses the conversation's message IDs and metadata to retrieve the full thread via Graph API, then generates a concise summary. In real-world scenarios, Copilot can also draft replies that reference attachments or previous meetings, which requires understanding of both the email content and related calendar events.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
What to study next
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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 365 Copilot — Microsoft 365 Copilot integrates with Outlook and other Microsoft 365 apps to provide AI-powered email thread summarization and draft reply generation. It uses large language models (LLMs) combined with your Microsoft Graph data to understand context and produce relevant, personalized responses. This capability is not available in other Microsoft 365 services like Viva Insights or Microsoft Editor.
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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