12.3 Copilot in Word, Excel, PowerPoint and Outlook

What you'll be able to do

Use Copilot in Word, Excel, PowerPoint and Outlook for the task each one is actually good at, and avoid the known trap in each. The four are not equally trustworthy.

Before you start

The two habits are already in place: four-part prompts, and checking before sending. Each section below is those two habits, applied in one app.

The work

1. Same either way: Word is the strongest of the four, because document work is entirely about changing the shape of something. Draft from your outline into styled prose. Rewrite a section to be tighter, or for a general reader. Summarise a long report you have to absorb, and ask for the summary with the section references, so that each statement can be checked. Then check two of them against the pages, as the standing habit says. The draft arrives in the document for normal editing. The styles and structure rules from the Word modules apply to it like any other text.
2. Same either way: Excel is the most restricted and the least trustworthy of the four, so hold it correctly. It wants the data as a proper Table, which is the Tables habit proved right again. It works well as an explorer: "show insights", or "what drives the variance?", pointing at patterns worth a look. And it works as a suggester of formulas. Here is the trap: a suggested formula that is believable and wrong. Read every suggested formula aloud, as the formulas module taught. Test it on a row you can check by hand before it fills a column. Insights are ideas to check with a PivotTable, not findings to forward. Open its pane with Alt+C where you have the licence.
3. Same either way: in PowerPoint the honest way to work is to draft and then rebuild. "Create a presentation from this document" produces a competent skeleton, and its slicing of the content into slides is genuinely useful, with generic design. Take the structure, then rebuild on your own master, using the slide-master lesson's machinery, and apply the design rules: cut, contrast, the 24-point floor. Sending the generated deck untouched is how a room learns you did not look at it. What it produces is a first draft in smart clothes.
4. Same either way: Outlook gives the most day-to-day value. Summarise a forty-message thread you were added to, asking for the decisions and the open questions, before you wade in. Draft replies from your one-line intent, such as "decline politely, propose next week". Get help sorting the inbox. The trap here is tone, because generated politeness reads as generated. For any mail where the relationship matters, the draft supplies the skeleton and your voice supplies the words, which is the stopping rule again. And the two-minute rule from the mail lesson still holds: a reply Copilot drafts in seconds still costs the reader minutes.
5. Same either way: here is the summary across the four, worth memorising as a posture. Word: strongest, and check the references. Excel: most dangerous, and check formulas by hand on one row. PowerPoint: structure yes, design no, so rebuild on your master. Outlook: daily value, and guard the tone. One tool, four different characters.

Try it

If you have the licence, run one real task in each app. Outline to draft in Word, checking two facts. A formula suggestion in Excel, checked by hand on one row. Document to deck in PowerPoint, rebuilding three slides on your master. A thread summary in Outlook, checked against the thread. If you do not, write the four four-part prompts you would run, and the checking step for each. The judgement is the skill.

Check yourself