Level 4 · Copilot, agents & integrations

4.3Copilot Chat: searching your documents

Goal: Use the “Work” Copilot chat to question your work world, with sources to back it.

Estimated time: 15 min · self-paced reading · If you only have 5 min: read “The essentials in 30s” + the diagram.

The essentials in 30 seconds

Ask before searching: the “Work” chat crosses emails, files and meetings in a single question.
Web or Work, know where you are: the world on one side, your internal data on the other.
Clicked sources, flagged over-sharing: check each claim and never exploit abnormal access.

Running case — Amine picks up the project thread again

Back from a week away on another site, Amine has lost the thread: where does lot B stand, what was said in meetings, which documents moved? Instead of digging through his mailbox then the team share, he opens the Copilot chat in Work mode: “Summarise lot B activity over the last two weeks, with sources”. He clicks two sources to check — and comes across a budget document he should not have seen: instead of exploiting it, he flags it to IT. Ask before searching, check before believing.

Sequel to cases 4.1-4.2 — Amine moves from communication to transversal search.

1. Transversal search

The most powerful business use of AI is neither writing nor summarising: it is transversal search across your own work world. The Copilot chat in “Work” mode crosses emails, files, meetings and conversations: “Where does lot B stand?”, “Prepare me for my 2 p.m. meeting”, “Which recent documents mention the budget?”.

Answers are sourced and stay within your access rights: in principle Copilot only shows you what you can already see — which also makes it a revealer of misconfigured sharing.

2. Web or Work: the switch

The same chat has two modes: “Work”, connected to your data via Microsoft Graph (emails, files, meetings), and “Web”, backed by general knowledge and the Internet. Amine checks the mode before each question: an internal question asked in Web mode gives a generic answer; a general question asked in Work mode pointlessly digs through his folders.

The transversal question (project, person, topic) pays best: it crosses in one sentence what classic search splits across four tools. And meeting preparation (“prepare me for my 2 p.m. meeting: context, participants, documents, open points”) is the no. 1 daily use.

3. Check and flag

Each claim links back to its sources: clicking to check remains the rule, since Copilot can misread a document, rely on an outdated version or approximate a synthesis. Well-kept internal documents (clear titles, dates) markedly improve answers.

And if an answer exposes content you should not have seen, it is a revealed over-sharing: a document shared too widely upstream. Amine's reflex: flag it to IT, not exploit it — AI reveals misconfigured sharing, it does not create it.

Common misinterpretation: “If Copilot shows me a document, I must be entitled to use it.” No. Copilot reflects existing sharing, including mistaken sharing: abnormal access revealed by an answer remains abnormal access. Showing it to others or exploiting it turns a sharing mistake into a personal fault.

Cross your work world

Text version of the diagram (SEO / screen readers / translation): 1) Amine checks he is in Work mode, then asks his transversal question about lot B. 2) He gets a sourced synthesis crossing emails, files and meetings. 3) He clicks two sources to check — and flags to IT the abnormally accessible document. Lesson: ask before searching, click before believing, flag before exploiting.

🔎 Concrete example — 🔎 Worked example — Ask before searching

Amine's three questions back from his trip:

“Summarise lot B activity over the last 2 weeks, with sources” → clicks 2 sources
“Prepare me for my 2 p.m. meeting: context, recent exchanges, documents, likely questions”
“Which recent documents mention the budget and who wrote them?”
→ unexpected content = over-sharing to flag to IT, not to exploit

Outcome: three transversal questions replace half a day of manual digging.

Lesson: always know whether you are in Web or Work mode before concluding.

Section vocabulary

“Work” mode

The Copilot chat connected to your data via Microsoft Graph: your emails, files, meetings — in principle never beyond your permissions.

Simple example: Amine questions lot B activity: the answer crosses his team emails and files.

What it is not: a public search engine on the Internet.

Reflex: check the mode indicator before each internal question.

“Web” mode

The same chat on general knowledge and the Internet: for anything not internal.

Simple example: Amine asks his general method questions there, without exposing team data.

What it is not: access to your internal documents.

Reflex: switch to Web for the generic, to Work for the internal.

Transversal question

A question crossing sources that classic search keeps apart: “where does [project] stand?”.

Simple example: “Where does lot B stand?” crosses emails, meetings and files in one sourced answer.

What it is not: keyword search in a single folder.

Reflex: phrase by project, person or topic rather than by location.

Meeting preparation

“Prepare me for my [time] meeting”: context, participants, recent exchanges, documents, open points.

Simple example: Amine arrives at his 2 p.m. meeting with context and likely questions already in hand.

What it is not: official minutes approved without re-reading.

Reflex: prepare each important meeting with this question, sources clicked.

Revealed over-sharing

Unexpected content in an answer = a document shared too widely upstream: to flag, not to exploit.

Simple example: Amine flags to IT the abnormally accessible budget document instead of reading it.

What it is not: implicit permission to use anything AI displays.

Reflex: on surprising content: capture the reference and alert IT.

In practice — In practice — The assistant that knows your files

Open the Copilot chat (Teams or professional account) and check Work mode.
“Summarise activity on [a real project] over the last two weeks, with sources” — click 2 sources to validate.
“Prepare me for my next meeting: context, recent exchanges, documents to re-read, likely questions”.
“Which recent documents mention [topic] and who wrote them?” — compare with the time manual searching would have taken.

The “ask before searching” reflex installed — sources checked, over-sharing flagged.

Ready-to-say script — flagging over-sharing to IT (30 s)

“Hello, this is Amine: while questioning the chat in Work mode about lot B, I got a budget document I should not normally see. I neither copied nor shared it. Can you check its sharing? I will send you the exact reference.”

To say or write without copying or sharing the document concerned.

Copy-paste template — standard transversal questions

PROJECT STATUS: Summarise [PROJECT] activity over the last 2 weeks, with sources.
MEETING PREP: Prepare me for my [TIME] meeting: context, participants, recent exchanges, documents to re-read, likely questions.
TOPIC: Which recent documents mention [TOPIC], who wrote them and when?
CHECKING: cite 2 clickable sources per important claim.

Without a Copilot licence

General assistants accept attached documents one by one: useful as a backup, without transversal emails + files + meetings search.

Poorly named internal documents

Title and date your files clearly (project, version, date): Work answers follow filing quality.

Answer backed by an outdated document

Check the date of each cited source before concluding: AI sometimes cites an expired version as reference.

Team and authorisations

Never ask Copilot to bypass a restriction (“show me what I cannot see”): the attempt itself is a fault.

Caution: Work mode exposes your company data (emails, files, meetings): stay within your authorisation scope, never try to obtain content outside your rights, and flag any abnormal access to your IT / CISO without copying or sharing it. Only use organisation-approved tools for such searches — never a public tool with internal documents. Educational content, not a purchase recommendation.

✓ Best practices

Always know whether you are in Web or Work mode.
Prefer transversal questions (project, person, topic).
Flag wrongly accessible content, do not exploit it.

✗ Common pitfalls

Confusing Web and Work modes.
Trusting a claim without clicking its sources.
Exploiting a document revealed by over-sharing.

Key takeaways

Work mode answers from your data; Web mode from the world: always know where you are.
The transversal question (project, person, topic) crosses what search keeps apart.
Each claim links back to its sources: clicking to check remains the rule.
Wrongly accessible content is flagged to IT — AI reveals misconfigured sharing, it does not create it.

48h challenge — apply tomorrow

Ask 1 real transversal question in Work mode, click 2 sources, and prepare 1 meeting with the chat — then compare with manual search time.

Section exit checklist