How to Use Copilot in Outlook in 2026: A Practical Walkthrough

To use Copilot in Outlook, open a message or start a new email, click the Copilot icon in the toolbar, and choose what you want it to do. Summarise the thread. Draft a new message. Get Coaching on a draft you have already written. Run a natural-language search across your inbox. Prepare for a meeting from your calendar. One thing to know up front: Copilot needs a paid Microsoft 365 Copilot or Copilot Pro licence to show up. It is not part of a standard Microsoft 365 plan. Ready to get hands-on with Copilot across Word, Excel, PowerPoint and Outlook? Our classroom course Copilot in Microsoft 365 Office (Singapore, WSQ-funded) walks through every feature on a live tenant.

I have been training working professionals on Microsoft Office for 24 years here in Singapore, and Copilot in Outlook is the single Office change that earns its keep fastest. Reading a long thread used to take ten minutes of scrolling. Now it takes three sentences. But only if you know where each feature lives and which prompt actually works. This guide walks you through how to use Copilot in Outlook on every surface — New Outlook, classic Outlook, Mac, web, and mobile — for the five jobs it does well, with real prompts you can copy.

What is Copilot in Outlook and what can it actually do

Copilot in Outlook is the AI assistant built into the Outlook mail and calendar app. It reads your email content, understands what you are trying to write or find, and helps you handle the inbox faster. You talk to it in plain English, the same way you would type a message to a colleague.

Copilot in Outlook handles five broad jobs:

• Summarise long email threads into a short brief with citations back to the source messages
• Draft a new email from a short prompt, or rewrite a draft you have started
• Coach you on tone, clarity, and how your reader is likely to react before you hit send
• Search and organise the inbox using plain-English queries
• Schedule and prepare for meetings from inside the calendar pane

Copilot is available across most Outlook surfaces. New Outlook for Windows, Outlook on the web, the latest Outlook for Mac, and the Outlook mobile apps on iOS and Android all support it. Classic Outlook on Windows has a narrower set of features but still supports drafting in the New Email window. The differences between surfaces matter, and the next section covers what works where.

The same paid licence unlocks Copilot across every Microsoft 365 app, so anyone who already has Copilot in Word or Excel will see it inside Outlook automatically once the rollout reaches their tenant. If you have not yet seen Copilot inside Word or Excel either, our companion walkthrough of how to use Copilot in Excel is a good gentler entry point — the licence and the activation steps are identical.

Before you start: licence, version, and where Copilot lives in Outlook

First, the licence question. This is where most “why don’t I see the Copilot button” problems begin.

Copilot in Outlook is not part of the standard Microsoft 365 Personal, Family, Business Standard, or Business Premium plan. Think of the Copilot icon like the priority queue at Changi airport. The standard subscription gets you on the plane. The priority queue is a separate ticket. To get the Copilot icon to appear inside Outlook, you need one of these:

• Microsoft 365 Copilot — a paid business add-on attached to Microsoft 365 Business Standard, Business Premium, E3, or E5
• Copilot Pro — a paid consumer add-on for Microsoft 365 Personal or Family subscribers
• A qualifying enterprise agreement that includes the Microsoft 365 Copilot SKU

If you are not sure which plan your company is on, ask your IT administrator or whoever runs your Microsoft 365 tenant. There is no free trial of Copilot in Outlook for business accounts. The free Copilot Chat at copilot.microsoft.com is a different product. Useful, but it does not put a Copilot button inside your mailbox.

Once the licence is active, three more things need to be true:

1. Outlook is up to date. On Windows, go to File then to your Office Account and choose Update Options, then click Update Now. On Mac, run Microsoft AutoUpdate. On mobile, update through the App Store or Google Play. Web Outlook updates itself.
2. You are signed in with the work or school account that holds the licence. Copilot will not appear under a personal account that does not have Copilot Pro.
3. Your message is composed in HTML, not plain text. In New Outlook and Outlook on the web, Draft with Copilot does not work on plain-text emails. To switch, open Settings → Mail → Compose and reply and choose HTML from the dropdown.

This last one trips people up surprisingly often. The Copilot button is there, you click it, nothing happens — and the reason is a plain-text setting from a tenant policy set in 2015. Worth checking first.

Here is where Copilot lives on each surface, so you know where to look:

If you have a Copilot licence but the icon still does not appear, the most common causes are an outdated Outlook build, a plain-text email, or a personal-account sign-in that is not the one with the licence attached.

How to use Copilot to summarise long email threads

Summarising a long email thread is the highest-value Copilot task for most working professionals. Open a thread that runs to twenty messages and you can have the situation in three sentences.

Steps:

1. Open the thread you want summarised. Either click the conversation in the inbox or open one of the messages.
2. Find the Summary by Copilot button at the top of the conversation. In some versions of Outlook it is labelled Summarize.
3. Click it. Copilot reads the full thread, pulls out the key points, decisions, and open questions, and inserts a short summary above the messages.
4. Read the summary, then click any numbered citation to jump to the source message in the thread. The citations are the small numbers inline with the summary text.
5. Ask follow-up questions in the Copilot chat pane. The useful ones are “What action items are assigned to me?”, “Who has not yet responded?”, and “What is the latest decision in this thread?”

The summary works on a single long email or on a multi-message conversation. For very long internal threads — say, twenty-plus replies on a project — break the summary into pieces by asking “Summarise the discussion from the first ten messages only,” then “Summarise from message eleven onwards.” You get cleaner results than asking Copilot to compress the whole thing in one pass.

Always read the summary before acting on it, especially on contractual or financial threads. Copilot can miss a single line where the decision actually sits. The quiet “approved” buried inside a long reply is the kind of thing that gets dropped. Treat the summary as a navigation aid, not a substitute for reading. Research from McKinsey on the state of AI in the workplace shows that the highest-ROI generative-AI use cases are still ones where a human reviews the output before acting on it — summarisation is exactly that pattern.

How to use Copilot to draft a new email

Drafting from a prompt is the second-most-used Copilot job. Once you know the steps, it takes well under a minute.

1. Click New Mail (or New Email) in Outlook. A blank message opens.
2. Click the Copilot icon, which sits on the toolbar just above your message body. Choose Draft with Copilot from the dropdown.
3. Type a clear, specific prompt in the Copilot box. For example: “Write a polite follow-up to a vendor whose delivery is two weeks overdue. Friendly but firm, four sentences, ask for a revised delivery date.”
4. Click the Generate arrow (or press Enter). Copilot writes the draft directly into the message area.
5. Review the draft. If it is close but not right, click Adjust to change tone or length, or type a refining instruction in the Copilot box: “Make it shorter,” “Make it warmer,” “Add a thank-you for previous deliveries.” Copilot rewrites in place.
6. Click Keep it. Edit the draft by hand, then send.

Two patterns make Copilot drafts much more usable. First, specify the audience. “To a senior partner in a law firm,” “to a long-time client we have not contacted in six months,” “to my team of five operations staff.” The tone of the draft shifts noticeably. Second, specify the length in words or sentences, not in vague terms. “150 words” gives a much more predictable result than “a short email.”

In New Outlook and Outlook on the web, there is also a chat-based drafting path. Click Help me write or Help me reply inside an email. The Copilot chat pane opens, and you can have a back-and-forth conversation about what the email should say. Copilot drafts into the message canvas as you talk, and you can edit the draft directly while still chatting. This is the one to reach for when you are not yet sure what you want to say.

How to use Copilot Coaching to improve a draft you have written

Coaching is the Copilot feature most people miss, and it is genuinely useful. Instead of writing a draft for you, Coaching reviews a draft you have already written and gives you a second pair of eyes on tone, clarity, and how the reader is likely to take it.

To use Coaching:

1. Write the email yourself first. You need at least 100 characters of text for Coaching to engage on mobile, and a reasonable paragraph on desktop.
2. Click the Copilot icon on the compose toolbar and choose Coaching by Copilot from the dropdown.
3. Read the coaching panel. Copilot returns three categories of feedback: tone (warm or cold, formal or casual, confident or hesitant), clarity (will the reader understand the request), and reader sentiment (how is the reader likely to react emotionally).
4. Apply suggestions. Click Apply all suggestions to let Copilot rewrite the whole message with the changes baked in, or accept suggestions one at a time using the panel.

Coaching is most valuable when the relationship matters more than the message. A piece of feedback to a team member that has to land softly. A delicate request to a client. A reply to a complaint. An apology after a slip. A sensitive update to a senior stakeholder. For routine internal updates, Coaching is overkill and the basic Draft feature is faster.

A workflow that works well: draft the email yourself in plain language words without worrying about tone, then run Coaching, then accept the tone changes and reject the clarity changes if your phrasing already works. The point of Coaching is the second pair of eyes on tone, not a full rewrite. Managers can be quite demanding about the tone of their team’s external emails; this is the feature that quietly handles it.

How to use Copilot to manage and organise your inbox

Beyond drafting and summarising, the Copilot chat pane in New Outlook and Outlook on the web acts as a natural-language inbox assistant. You ask, in plain English, and Copilot searches, filters, summarises, and answers.

The Copilot chat pane is the entry point. In New Outlook it sits on the right sidebar. In Outlook on the web it opens from a Copilot button in the header. Once open, queries that work well include:

• “Show me unread emails from this week marked High importance.”
• “Find the email confirming the budget approval for the customer-portal project.”
• “Summarise the messages from the finance team in the last seven days.”
• “What emails am I expected to reply to today?”
• “Find every email that mentions the WSQ submission deadline.”
• “Show every message from our IT vendor sent in July, with the renewal-related ones first.”

Copilot answers in the chat pane with a short written summary, a citation list, and clickable links back to the source emails. It does not move, delete, or flag messages on its own. The inbox remains exactly as you left it.

For ongoing inbox management, Copilot pairs well with Outlook’s existing rules, focused inbox, and categories features. Copilot can suggest a rule when you ask “How can I stop missing emails from clients?”, but you still apply the rule manually through Outlook’s settings. If your team wants to go further than this and into automated triage workflows that move beyond a single mailbox, our companion course on building agentic AI automations without coding is the next step.

Copilot in the Outlook calendar: scheduling and meeting prep

The calendar is the second half of Outlook, and Copilot is at least as useful there as in mail. Most popular Copilot-in-Outlook tutorials skip this surface, which is a pity. The calendar is where the executive day actually disappears.

Three calendar tasks Copilot handles well:

1. Brief me before a meeting. Open a calendar event, click the Copilot icon, and ask “Prepare me for this meeting” or “What do I need to know before this call?” Copilot pulls together the email thread that led to the meeting, the attendee list, any related documents that have been shared, and a one-paragraph brief on the context. For anyone who lives in back-to-back meetings, this is the single most useful Copilot calendar task. A 60-second pre-meeting ritual replaces a frantic five-minute scramble through old emails.

2. Find a meeting time. From the calendar, open the Copilot chat pane and ask “Find a 45-minute slot next week when I, Priya, and James are all free, mornings only.” Copilot reads everyone’s free/busy and suggests two or three options. You confirm and Copilot drafts the invitation for you to send.

3. Turn an email into a meeting. Inside an email thread, ask “Schedule a 30-minute meeting based on this conversation, with everyone on this thread, sometime next week in the afternoon.” Copilot drafts the meeting invite with the relevant subject line, the right attendee list, and a short agenda derived from the email thread. You review, adjust the time, and send.

The calendar features in Outlook Copilot work the same on Windows, Mac, and Outlook on the web. They are more limited in classic Outlook and on mobile. The mobile app has a basic find-a-time feature but not the full brief-me-before-a-meeting flow.

Outlook mobile: using Copilot on the go

Most Copilot-in-Outlook tutorials skip the mobile experience, which is odd because for many Singapore professionals the mobile app is where the first email of the day gets read on the MRT. Mobile Copilot is more limited than desktop, but it is still useful for the right tasks.

On Outlook for iOS or Android with a Copilot licence:

1. Tap New Mail to start a new message.
2. Tap the Copilot icon sitting on the compose-screen toolbar.
3. Choose Draft with Copilot to draft from a prompt, or Coaching by Copilot to improve a draft you have already written.
4. Type your prompt or compose your draft. Coaching needs at least 100 characters of text. Drafting accepts any length.
5. Review and choose Keep It, Discard, or Regenerate.

You can also tap a long thread in the inbox and ask Copilot to summarise it. The same Summary by Copilot button appears at the top of the thread on mobile. Tap-to-cite navigates you to the source message just like on desktop.

What does not yet work well on mobile is the natural-language inbox search and the calendar brief-me-before-a-meeting flow. Both are available, but the chat pane is more cramped on a phone screen and the results are sometimes shorter than on desktop. For complex queries, switch to desktop or web Outlook.

The mobile experience is good enough for drafting short replies on the way to the office, summarising threads before a meeting, and a quick coaching pass on a sensitive message before you send it. For inbox triage and calendar prep, the desktop is where the real work still happens. If your day starts in Word or PowerPoint before you ever open Outlook, our walkthrough of how to use Copilot in Word is the sister piece — the prompt style is identical.

Prompts that actually work in Outlook Copilot (with examples)

The difference between a good Copilot session and a frustrating one is almost always the prompt. The default prompts Microsoft suggests inside the Copilot box are bland on purpose — they will give you a bland draft. Below are prompts that produce genuinely useful results, grouped by job. Copy the closest match and adjust the specifics.

Drafting emails (replies and new messages):

• “Write a polite follow-up to a vendor whose delivery is three weeks overdue. Four sentences, friendly but firm, ask for a revised delivery date and a reason.”
• “Draft a reply to a client who is unhappy that we missed a deadline. Acknowledge the impact, take responsibility, propose a recovery plan in two specific steps, and close warmly.”
• “Write an internal email to the team announcing that the office will be closed on the upcoming public holiday in Singapore. Friendly tone, two short paragraphs, signed by the HR lead.”
• “Draft a cover note for a WSQ training proposal addressed to an L&D manager at a Singapore SME, requesting a 30-minute exploratory call next week.”
• “Reply to this thread accepting the meeting invitation, confirming that I will join from the office, and asking whether the meeting brief has been shared.”

Summarising threads:

• “Summarise this thread in five bullet points. Group action items by person.”
• “What decisions have been made in this thread, and what is still open?”
• “Pull out every commitment I have made in this thread, with the deadline next to each.”
• “Summarise this thread for a senior manager who has 60 seconds to read it.”

Coaching a draft:

• “Review this email for tone. The recipient is a long-time client who is unhappy.”
• “Is this email clear? A non-technical reader should understand the request in one read.”
• “Make this message warmer without losing the deadline.”

Searching the inbox:

• “Find the email from the finance team last month that approved the budget for the customer-portal project.”
• “Show all messages where someone has asked me for a status update and I have not replied yet.”
• “Find every email from our IT vendor in the last 90 days that mentions a renewal.”

Calendar and meetings:

• “Prepare me for my next meeting with the marketing team. Pull the related email thread and the latest document we shared.”
• “Find a 45-minute slot next week when Priya, James, and I are all free, mornings only, with at least 15 minutes between meetings.”
• “Turn this email thread into a meeting invitation. Pick a 30-minute slot next week in the afternoon and include everyone on the thread.”

For a structured walkthrough of these prompts and many more, on the live Outlook ribbon with worked examples, our in-person course on Copilot for Microsoft 365 covers each use case as a hands-on exercise.

Common Copilot-in-Outlook mistakes (and how to fix them)

A short list of issues that quietly waste time in real Copilot-in-Outlook sessions, with the fix for each. After 24 years of training in Singapore — specifically, 24 years of training working professionals on Microsoft Office across our Singapore classroom — I can tell you that the same five mistakes come up in every cohort.

The Copilot button is missing entirely. Most often this is the licence. Confirm with your IT admin that a Microsoft 365 Copilot or Copilot Pro licence is attached to the account you are signed in to. Second cause: an outdated Outlook — run Update Now. Third cause: you are signed in with a personal account that does not have Copilot Pro attached.

Draft with Copilot does nothing in a new email. The message is almost certainly composed in plain text. Open Settings → Mail → Compose and reply, change the dropdown to HTML, and try again. This is the silent failure mode most people hit first, and almost nobody figures it out without help.

The summary missed the most important point in the thread. Copilot summaries are stronger on long, single-topic threads than on long, multi-topic ones. If a thread has drifted across three different projects, split your summary request: “Summarise the discussion about the customer portal only,” then ask separately about the other topics.

Copilot produces a draft with hallucinated names, dates, or numbers. It is generating text from patterns. For specific facts you have not given it, it will sometimes invent. Always check names, dates, monetary figures, and citations before sending. For drafts that touch numbers or commitments, paste the actual figure into the prompt rather than asking Copilot to recall it.

The tone of the draft is wrong for your relationship with the recipient. Be more specific in the prompt. “Friendly but firm,” “warm but professional,” “direct, no small talk,” and “apologetic without grovelling” all produce noticeably different drafts. Five extra words on tone is the highest-leverage edit you can make to any prompt. Of course your boss will be unhappy if a polite client follow-up comes out sounding like a debt collection letter. Specifying the tone takes ten seconds.

Copilot cannot find an email you are sure is in the inbox. Two common causes. First, the email may be in an archived folder Copilot does not scan by default. Try searching directly with the Outlook search bar first. Second, the email may be in a shared mailbox where the chat pane has limited access. Switch to your own mailbox to confirm Copilot can see it there.

If you want a structured way to learn these workflows and to build a tested prompt library for your own role, our Digital Transformation with AI Tools course covers Copilot across Word, Excel, PowerPoint, Outlook, and Teams in a single programme.

Closing

You now know how to use Copilot in Outlook for every common task: summarising long threads, drafting and replying to messages, coaching a difficult email before you send it, organising the inbox by natural-language search, preparing for meetings, and running the calendar. The two biggest determinants of a useful session are an active Copilot licence and a clear, specific prompt. Everything else is practice.

I hope you’ll find this useful. Do try it out today on a real task. Pick a long email thread sitting in your inbox right now and click Summary by Copilot. Then pick a draft email you have been putting off because the tone is hard, and run Coaching on it. After three or four small experiments like this you will quickly build an instinct for which jobs to hand to Copilot and which to keep for yourself. That instinct is the actual skill — not the buttons.

If you want to learn Copilot in Outlook alongside Word, Excel, and PowerPoint with hands-on practice on a live Microsoft 365 tenant, join us in the classroom: Word, Excel, PowerPoint & Copilot in Microsoft 365 Office — a WSQ-funded, SkillsFuture-claimable course delivered in Singapore.