Copilot in Outlook: How to Triage Email and Draft Replies Faster

Use Copilot in Outlook in three moves: turn on Prioritise so new mail is marked high, normal or low with a one-line reason; open long threads with Summary by Copilot at the top of the conversation; then reply with Draft with Copilot and check tricky ones with Coaching by Copilot. Set drafting instructions once so replies sound like you.

Two limits shape how you set it up. Copilot's Outlook features work only on your primary mailbox, not on shared or delegate mailboxes, so an enquiries address set up as a shared mailbox gets no help. And Prioritise only scores mail that arrives in your Inbox after you switch it on; anything a rule moves to another folder is never scored.

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The free Microsoft Copilot Chat included with business plans can already answer questions about your inbox and calendar inside Outlook. A paid Copilot licence adds reasoning across your emails, meetings, chats and files together, which matters when a reply needs a figure from a document rather than another email. Both are covered below, with the settings that make each worth using.

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Four settings worth ten minutes before the first morning

For this walk-through, imagine a photography studio with an owner-photographer, an associate and a studio manager who handles the inbox. On a weekday the manager's mailbox receives about 85 emails: around 12 new enquiries, 18 client messages about galleries, albums and reschedules, 10 from suppliers and venues, and 45 newsletters and system notifications. The manager has a Copilot licence; the other two use free Copilot Chat. Before the first real morning, the manager changed four things.

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1. Enquiries into a primary mailbox. The studio's hello@ address was a shared mailbox, where Copilot doesn't work. The fix was to retire the shared mailbox and add hello@ as an extra email address (an alias) on the manager's own mailbox in the Microsoft 365 admin centre, so enquiries arrive where Copilot can read them. The trade-off is that only one person now sees them, which suits a studio where one person answers enquiries anyway.

2. Prioritise switched on, with instructions. In new Outlook for Windows, select the arrow next to the Copilot button at the top right and choose Prioritise; Copilot walks you through setup and needs at least one high-priority instruction to start. Microsoft notes it does best with phrases ("it's from...", "mentions...", "contains...") rather than single words. The studio's instructions, added later under Settings > Copilot > Prioritise:

HIGH PRIORITY
It's a new wedding, portrait or commercial enquiry
It mentions a shoot date in the next 30 days
It's from our album printing lab about a delay or reprint
It mentions a complaint, a refund or a cancellation

LOW PRIORITY
It's a newsletter or a promotional email
It's an automatic notification from our gallery or booking system

The low-priority marker is off by default; turn it on in the same settings page so newsletters get a down arrow. You only need to set this up once: Microsoft says that turning Prioritise on in one place, such as your desktop, switches it on in Outlook on your phone too, where the high-priority emails are gathered behind an icon beside the notification bell at the top of the list.

3. Drafting instructions. Open the dropdown next to the Copilot icon, select Settings, then Draft Instructions, switch on Use custom instructions when drafting email, write your instructions and select Save. The studio's version appears later, after the first draft showed why it was needed.

4. HTML, not plain text. In new Outlook and Outlook on the web, Draft with Copilot doesn't work in messages composed as plain text. The manager's account had been set to plain text years earlier; switching to HTML under Settings > Mail > Compose and reply made the Copilot box appear.

A twenty-minute morning triage, in order

With the settings in place, the manager's morning follows the same five steps:

1. Filter to high priority. Use the filter or sort control at the top of the message list to show high-priority mail only. Each message's first line is replaced by a short summary, and the reading pane shows a few lines on why Copilot thinks it matters. Most mornings that's 15 to 20 emails.
2. Summarise the long threads. Select a conversation and choose Summary by Copilot (or Summarise) at the top. The summary includes numbered citations that jump to the email each point came from. For PDF, Word or PowerPoint attachments, Summarise a file does the same for the document.
3. Ask Copilot Chat for the stragglers. In the Copilot pane, ask something like "Which emails since 5pm yesterday need a reply from me today?" Copilot can also pin, flag, archive or delete messages from the chat, and create Outlook rules from a plain-language request.
4. Draft the replies. Use Draft with Copilot for each reply, review, adjust tone or length from the dropdown, select Keep it, edit and send.
5. Coach the two or three hard ones. Complaints, apologies and anything about money get a pass through Coaching by Copilot before they go.

Two chat requests that save the most clicks

Step 3 is where the free and paid versions both help, and where the answers need the most checking. On the first Monday the manager asked: "Which emails since 5pm Friday need a reply from me today? List them with the sender and what they need." The illustrative answer listed seven: three enquiries, a venue asking for the insurance certificate, a client choosing album photos, the printing lab querying a colour profile, and a newsletter from a lens supplier with "reply by Friday to claim your discount". The newsletter was noise; more importantly, a client's reschedule request was missing, because it had been sent to the owner rather than the manager, and Copilot only reads your own mailbox. The fix was a weekly two-minute check with the owner, not a better prompt.

The second request turned a fiddly settings task into one sentence: "Create a rule that moves emails from our gallery platform's notification address into a folder called Gallery alerts." Copilot set the rule up from the chat. It was a sensible use of a rule, because those notifications don't need scoring anyway; moving them also kept the prioritised inbox shorter. The lesson from the enquiries folder (below) still applied: never move mail you want Prioritise to judge.

After four weeks the manager's own log (illustrative) showed the change:

Eighty minutes a day is more than six hours a week. At an illustrative $25 an hour, that's roughly $650 a month of the manager's time against a $21 licence. Replies saved the least, because good replies still need a person to decide what to say; the reading and sorting saved the most. For a broader approach that isn't tied to Outlook, managing your inbox with AI covers triage, drafts and follow-ups in general.

Summaries you can use, and the line to check

A nine-message thread with a couple and their venue coordinator about a wedding-day timeline produced this summary (illustrative):

1. Ceremony moved from 1pm to 2pm [2]
2. Couple want a second shooter for the reception only [5]
3. Venue coordinator needs the studio's insurance certificate [7]
4. Open question: are drone shots allowed at the venue? [9]

Three of the four points were right. The first wasn't quite: message 8, from the coordinator, had moved the ceremony again to 2:30pm, and the summary took the time from message 2. Clicking citation [2] and scrolling on showed the later change. The habit that prevents this is simple: for any time, date, price or number that goes into your diary or a quote, click its citation and read to the end of the thread. Summaries are for knowing what a thread is about in ten seconds, not for replacing the one message that matters.

Drafting replies that sound like the studio

The first enquiry reply shows why the drafting instructions matter. The enquiry: "Hi! Are you free on 14 June next year? Small wedding, about 40 guests, ceremony at 1pm. What are your prices?" The manager's prompt in Draft with Copilot: "Reply warmly. The date is free. Explain we have three wedding collections and offer a 20-minute call this week."

The illustrative draft was friendly and well structured, with two problems. It said "our collections start from $1,800", a figure the studio has never charged, and it offered to "hold the date for you for seven days", when the studio only holds dates once a booking fee is paid. Neither came from the prompt; Copilot filled gaps with plausible business language. Both would have created awkward conversations later.

The drafting instructions the manager then saved:

"Write as the studio in a warm, brief tone, under 150 words unless I ask for more. Never state prices; say our brochure has full details and I'll send it. Never offer to hold a date; dates are secured with a booking fee. Don't promise delivery times for galleries or albums. Use the couple's first names if they're given, and sign off with my first name."

The same enquiry, redrafted with those instructions (illustrative): "Hi [first name] and [first name], congratulations! Good news: 14 June is currently free. We have three wedding collections, and our brochure has the full details, which I'll send over today. Would a 20-minute call this week suit you? I can do Tuesday or Thursday evening. Just so you know, we secure dates with a booking fee once you've chosen a collection. [Manager's first name]." Nothing invented, and the booking-fee line now appears because the instructions told Copilot what the studio does. More on building a reply style that holds up is in drafting customer email replies with AI that sound like you, and enquiry replies for wedding businesses specifically are covered in how wedding suppliers can reply to enquiries in minutes.

Coaching the emails you'd rather not write

Coaching by Copilot reviews a draft you've written and suggests changes to tone, clarity and how the reader is likely to feel. You open it from the Copilot icon while composing, and you can apply all suggestions at once or pick them by hand. It's most useful on the emails you write while annoyed.

The owner drafted this reply to a client chasing a late gallery: "As stated in our contract, galleries take up to eight weeks. We are currently at week seven. The gallery will be delivered within the contracted timeframe." Every word accurate, and likely to lose a referral. Coaching's illustrative feedback: open by acknowledging the wait, remove "as stated in our contract", and give a specific date. The owner applied two of three suggestions and kept the reference to eight weeks, rewritten: "I'm sorry the wait has felt long; I know how excited you are to see them. Your gallery is in its final edit and will be with you by Friday 12th, a few days inside the eight weeks we plan for." Choosing suggestions individually kept the owner's voice, which "apply all" tends to flatten.

What free Copilot Chat covers, and what the licence adds

Microsoft describes three levels of grounding, and they explain why the manager's Copilot could do things the owner's free Chat couldn't:

For an owner who mainly needs catch-up summaries, the free level may be enough. For the person whose replies depend on documents, the licence earns its place. Chat with Copilot in Outlook needs a work account and new Outlook for Windows or Outlook on the web. If a button described here is missing, Microsoft's advice is to check with whoever manages your Microsoft 365, since availability depends on your licence and Outlook version. Planning who gets a licence is covered in rolling out Microsoft 365 Copilot to a small team.

Where Copilot in Outlook falls short

• Shared, delegate and group mailboxes. Copilot works on your primary mailbox only. Teams that answer customers from a shared inbox need a different approach; AI triage for shared inboxes covers the options.
• Mail moved by rules. The studio's old rule sent anything containing "enquiry" to an Enquiries folder, so for the first week Prioritise scored none of them. Prioritise only evaluates mail delivered to the Inbox. The manager switched the rule off and filtered by priority instead.
• Older mail. Prioritise scores mail that arrives after you turn it on, and changes to your instructions only apply to new mail. Don't judge it on the backlog.
• Mail it skips. Prioritise doesn't evaluate out-of-office replies, meeting invitations and responses, messages the sender marked low importance, very short messages or encrypted mail it can't read. Copilot's features also don't work on signed, S/MIME-encrypted or rights-protected emails.
• Languages and rollout. Prioritise currently supports Microsoft's most widely used (Tier 1) languages and is being rolled out gradually, so it may appear days later for some users.
• Plain-text drafting. Draft with Copilot won't work in plain-text messages in new Outlook and on the web; switch to HTML.

If your business runs on Gmail instead, the equivalent routine is in using Gemini in Gmail to clear your inbox faster. Either way, the pattern holds: let the AI sort and summarise, keep a person on every number and promise, and write your instructions down once so every draft starts closer to right.

Further reads

• How Photographers Can Handle Client Emails With AI — Client email templates for photographers, beyond Outlook.
• AI Email Triage for Professional Firms: Sort, Summarise, Draft — Triage rules for firms with heavier, more formal inboxes.
• Can AI Answer My Business Emails for Me? — Where AI can answer email alone, and where it shouldn't.
• Copilot Chat vs Microsoft 365 Copilot: What Do You Get Free? — What the free Copilot Chat gives you before buying licences.
• Does Microsoft 365 Copilot Keep Your Business Data Private? — What happens to the emails Copilot reads.
• Is Microsoft 365 Copilot Worth It for a Small Business? — Whether the licence pays for itself in your business.
• Can AI Manage Your Calendar and Book Meetings for You? — The five kinds of AI scheduling tool, which one fits who books whom, and the diary rules to write before letting any of them near your calendar.
• How to Use AI on Your Own Admin First, Then Roll It Out — A six-week owner-first plan: pick three of your own admin jobs, log what AI saves and gets wrong, write a playbook, then hand one task to one person.
• Best AI Tools for Travel Agents: Itineraries, Emails and Research — AI tools for travel agents sorted by the three jobs that eat the week, with prices, what each is weak at, and three example setups by agency size.
• How Small Law Firms Use AI to Answer Client Status Questions — A status-note template, drafting prompts and approval rules so AI answers 'where are we?' from the matter record instead of guessing.
• How to Get a Weekly Business Summary Emailed to You by AI — Get a Monday email with your five key numbers and a short AI commentary. Covers the numbers tab, Zapier and Make builds, assistant scheduled tasks and checks.
• How to Measure Whether Copilot Is Paying for Itself — A seven-stage method for checking whether Microsoft 365 Copilot licences pay back, using Microsoft's own reports, a timed sample and one honest sum per person.
• ChatGPT or Copilot for a Microsoft 365 Business? — Decide whether a Microsoft 365 team needs paid Copilot, ChatGPT or included chat, using a two-user cost and workflow trial.
• Copilot in Teams Meetings: Recaps, Actions and Privacy Settings — Licences, meeting options and admin policies for Copilot in Teams, plus prompts, a task clean-up routine and the privacy settings to decide first.
• Microsoft 365 Copilot Readiness Checklist for Small Businesses — Licences, mailboxes, update channels and SharePoint oversharing checks, each with how to verify it, plus a boutique hotel's filled-in results.
• Is Copilot Pro Worth It for a Sole Trader? — Copilot Pro is retired. The four options that replaced it for a one-person business, priced for a year, with the traps in a single-user Microsoft account.
• AI Tools and AI Development: The Complete 2026 Guide — the AI hub, including every tutorial in the AI-for-business series.

Sources: Microsoft Support articles on summarising a thread, drafting with Copilot, email coaching, prioritising your inbox, making drafts sound like you, and the Copilot in Outlook FAQ; Microsoft Learn overview of Microsoft Copilot Chat grounding. All checked September 2026.