What is Microsoft Copilot, and when does it become an agent?

Most people encounter Copilot as a chat assistant. You type a question, it replies, and that is the end of the interaction. That is Copilot as a chatbot.

Copilot becomes an agent when it goes beyond answering and starts doing. It can browse the web to gather current information, connect to your Microsoft 365 account to read emails and calendar events, draft documents directly inside Word or PowerPoint, analyze spreadsheets in Excel, and summarize entire meeting transcripts in Teams. You give it a goal and it figures out what to pull in and how to get there.

The shift from chatbot to agent happens automatically based on what you ask. There is no separate agent mode to turn on. Ask a simple question and you get a quick answer. Ask it to research a topic, build a slide deck, or summarize your week in email, and it executes the task. For a deeper look at how agents and chatbots differ in general, see our guide on what AI agents are and how they differ from chatbots.

Desktop or browser: where should you use Copilot?

Copilot works in multiple places, and the right one depends on what you are trying to do.

Browser: copilot.microsoft.com is the standalone web experience. It works on any modern browser on Mac, Windows, or Linux. This is the best starting point for general tasks like research, drafting content, asking questions, and generating images.

Windows 11 taskbar: If you are on Windows 11, Copilot is built into the operating system. You can open it with a keyboard shortcut or the taskbar icon. It works similarly to the browser version but is always one keystroke away while you are working in other apps.

Microsoft 365 apps: This is where Copilot becomes genuinely powerful. If you have a Microsoft 365 subscription, Copilot is embedded directly inside Word, Excel, PowerPoint, Outlook, Teams, and OneNote. You do not switch to a separate window. Copilot is right there inside the app you are already working in.

Mobile: Copilot has iOS and Android apps for quick tasks on the go, though the full Microsoft 365 integration is best experienced on a desktop.

For serious agent work, the Microsoft 365 app integration is the most capable environment. If you spend your day in Word, Outlook, and Teams, that is where you will get the most out of Copilot.

What is Copilot built on?

Copilot is powered by OpenAI's models, the same technology behind ChatGPT. Microsoft has a major investment in OpenAI and built Copilot as its own product layer on top of that foundation, adding tight integration with Windows, Microsoft 365, and Bing. If you have used ChatGPT before, a lot of Copilot will feel familiar since they share the same underlying model, but the Microsoft ecosystem integrations are what make Copilot distinct.

What plan do you need?

Free: Available at copilot.microsoft.com with no account required, though signing in with a Microsoft account unlocks more. You get access to GPT-4o, web browsing via Bing, image generation, and basic conversation history. Good for everyday questions and light drafting.

Copilot Pro ($20/month): Priority access to the latest models, faster performance during peak hours, and integration with Microsoft 365 apps on your personal subscription. This is the plan for individuals who want Copilot working inside Word, Excel, PowerPoint, Outlook, and OneNote. Also includes Copilot Pages and higher image generation limits.

Microsoft 365 Copilot ($30/user/month): The enterprise plan, designed for businesses and teams. This includes everything in Pro plus deeper integration with SharePoint, Teams meeting summaries, Copilot Studio for building custom agents, admin controls, and compliance features. If your company is on Microsoft 365 and your IT team enables it, this is what your organization would use.

For most professionals reading this guide, Copilot Pro at $20/month covers the features described here.

Web browsing and research

Copilot can browse the web in real time through its Bing integration. When you ask about something current, like recent news, today's prices, or a product released last month, Copilot searches the web and grounds its answer in live sources rather than relying solely on its training data. Every response that pulls from the web includes citations so you can verify where the information came from.

For deeper research tasks, Copilot can go further. You can ask it to research a topic thoroughly, and it will pull from multiple sources, synthesize the findings, and deliver a structured summary. This works best when you give it a specific, well-scoped question rather than a broad topic.

Example prompts:

"Search the web and give me a summary of the current regulatory environment for data privacy in the EU. I need to understand what has changed in the last 12 months and what businesses are required to do."

"Research the top project management software options for a team of 15 people. I want a comparison of features, pricing, and what types of teams each one is best suited for. Cite your sources."

"Find recent news about supply chain disruptions in the semiconductor industry and summarize the key developments and their likely impact on electronics manufacturing."

Microsoft 365 integration: Copilot's biggest advantage

If you are already working in Microsoft 365, Copilot's integration is its most compelling feature. Because it lives inside the apps you already use every day, there is almost no friction. You are not switching to a separate tool. Copilot is a panel right inside the app, ready when you need it.

Outlook

Copilot in Outlook can read your emails, summarize long threads, draft replies, and help you write new messages. One of the most useful features is thread summarization: if you have been added to a long email chain mid-way through, Copilot can read the whole thing and give you a one-paragraph summary of what has happened and what decisions were made.

Example prompts:

"Summarize this email thread and tell me what action items are waiting on me."

"Draft a reply to this email that accepts the meeting request but asks to move it from Tuesday to Thursday. Keep it short and professional."

"Write an email to our vendor asking for a 30-day payment extension. Explain that we are restructuring our accounts payable process and expect to be back on our standard schedule after that. Keep it polite and direct."

Word

Copilot in Word can draft documents from scratch, rewrite sections, summarize long documents, change the tone of your writing, and help you structure content. You can describe what you need and get a full first draft, or highlight existing text and ask Copilot to improve it.

Example prompts:

"Write a first draft of a project proposal for a website redesign. The client is a mid-sized law firm. Include sections for project overview, scope of work, timeline, deliverables, and investment. Use a professional tone."

"Summarize this 20-page report into a one-page executive summary. Focus on the key findings, the recommended actions, and the expected outcomes."

"Rewrite this section in a more confident and direct tone. Remove any hedging language and make sure each sentence is easy to understand."

Excel

Copilot in Excel can analyze data, identify trends, build formulas, create charts, and explain what the numbers mean. You do not need to know Excel functions. You describe what you want to find out and Copilot figures out how to surface it.

Example prompts:

"Analyze this sales data and tell me which product categories had the highest growth month over month. Highlight any categories where growth has been declining for three or more consecutive months."

"Create a formula that calculates the weighted average deal size for each sales rep, weighted by the number of deals they closed."

"Build a chart that shows our monthly revenue trend for the last 12 months and add a trendline. Format it so it is ready to drop into a presentation."

PowerPoint

Copilot in PowerPoint can build entire presentations from a brief, transform a Word document into slides, add speaker notes, redesign the layout, and summarize existing decks. This is one of the fastest ways to go from an idea to a presentation that is ready to refine.

Example prompts:

"Create a 10-slide presentation on the benefits of moving our IT infrastructure to the cloud. The audience is a non-technical executive team. Include talking points for each slide."

"I have a Word document with our Q1 business review. Turn it into a PowerPoint presentation with one key idea per slide. Use our standard blue and white color scheme."

"Add speaker notes to each slide in this deck. The notes should give me enough detail to present confidently without reading directly from the slides."

Teams

Copilot in Teams is most valuable for meeting productivity. If your organization uses Teams for meetings, Copilot can join a call, follow along in real time, and after the meeting deliver a full summary with key points, decisions made, and action items assigned to specific people.

Example prompts:

"Summarize what was discussed in today's meeting. List the decisions that were made and the action items, with who is responsible for each one."

"During the call, what did the client say about their timeline and budget constraints?"

"Write a follow-up email I can send to attendees summarizing today's meeting outcomes and next steps."

OneNote

Copilot in OneNote can summarize your notes, pull out action items, reformat content, and help you draft new notes based on a brief description.

Example prompts:

"Summarize my notes from the last three client meetings and pull out any open questions or things I said I would follow up on."

"Rewrite these rough notes from today's brainstorm into a clean, structured summary I can share with the team."

File handling: OneDrive, SharePoint, and local files

Copilot can access files stored in OneDrive and SharePoint on a Microsoft 365 plan. You can reference a specific document by name or ask Copilot to search your files for relevant content. This works particularly well when you are already inside a Microsoft 365 app, since Copilot can pull in related files from your OneDrive without you needing to manually upload anything.

One important limitation: Copilot at copilot.microsoft.com cannot access your local file system or folders on your hard drive directly. To work with a local file, you need to either upload it to the conversation or move it to OneDrive first.

Inside the Microsoft 365 desktop apps (Word, Excel, PowerPoint), Copilot can work with whatever document is currently open, which effectively gives it access to local files you have open in those apps even if they are not saved to the cloud yet.

Copilot Pages: the collaborative workspace

Copilot Pages is a feature within Copilot that creates a shared, editable document from your conversation. When you are researching a topic or building out a plan with Copilot, you can send the output to a Page rather than leaving it in the chat.

A Page opens as a full document inside the Microsoft 365 ecosystem. You can edit it directly, continue prompting Copilot to add to it, and share it with teammates who can collaborate on it in real time. Think of it as a lightweight document that lives between a chat conversation and a full Word file.

It is particularly useful for research outputs, project briefs, and meeting prep documents that you want to work on with others or come back to later.

Copilot Studio: building custom agents

Copilot Studio is Microsoft's tool for building your own specialized agents. You access it at copilotstudio.microsoft.com and it is available on the Microsoft 365 Copilot plan. You do not need to write any code to use it.

The idea is straightforward. A custom agent is essentially a regular Copilot session, but with context baked in permanently so you never have to re-explain it. You give the agent a name, a set of instructions describing its role and how it should behave, and knowledge sources like internal documents, SharePoint sites, or web URLs. Every conversation you have with that agent starts with all of that context already loaded.

The reason you would build one is that most professionals have recurring tasks that always require the same background knowledge. A financial analyst who regularly needs to interpret reports in the context of their company's internal benchmarks can build an analyst agent loaded with those benchmarks, their methodology documents, and preferred output formats. A customer success manager could build an agent trained on their product documentation and common support issues. A marketing team could build a brand voice agent that already knows their guidelines, audience, and tone. Once the agent is set up, anyone on the team can use it and get consistent, context-aware results without starting from scratch each time.

For a specific example: a customer success manager might upload their product documentation, a list of the most common support issues and their resolutions, and a guide on how the company likes to communicate with customers. From then on they could ask the agent things like "draft a reply to this customer who is frustrated about the onboarding process" or "what does our documentation say about how to handle a billing dispute?" and get answers that are grounded in actual company knowledge rather than generic AI responses.

Getting started: your first session with Copilot

Step 1: Start at copilot.microsoft.com

Open a browser and go to copilot.microsoft.com. Sign in with your Microsoft account. Even on the free tier, you get a good sense of what Copilot can do. Try a web research task or ask it to draft something for you.

Step 2: Connect your Microsoft 365 apps

If you are on Copilot Pro or Microsoft 365 Copilot, open Word, Outlook, or Excel and look for the Copilot icon in the toolbar or Home ribbon. Click it to open the Copilot panel. This is where most of the productivity value lives, so getting comfortable here early makes a big difference.

Step 3: Try a real task in Outlook

The fastest way to see the value is in Outlook. Find a long email thread you have been meaning to catch up on and ask Copilot to summarize it. It takes about five seconds and gives you a clear picture of what happened and what you need to do. That one use case alone tends to convince people that Copilot is worth paying for.

Step 4: Build a document in Word with Copilot

Open a blank Word document, click the Copilot icon, and describe something you need to write. Give it enough context: who the audience is, what the purpose is, and roughly how long it should be. The first draft will not be perfect, but it will be a real starting point you can work from rather than a blank page.

Step 5: Set up your custom instructions

In the browser version at copilot.microsoft.com, go to settings and look for custom instructions or personal preferences. Describe your role, how you like to communicate, and any context that would make Copilot more useful to you by default. Once set, every conversation starts with Copilot already knowing who you are.

What Copilot does best

After working through the full feature set, a few areas stand out as where Copilot genuinely saves time:

Microsoft 365 integration. If you live in Outlook, Word, Excel, Teams, and PowerPoint every day, Copilot is the most natural AI to add to your workflow. It is already in the apps you use, which means there is almost no friction to reaching for it.

Email management. Thread summarization and reply drafting in Outlook are among the highest-value day-to-day use cases. The time saved on a busy email day adds up fast.

Document creation and editing. The combination of Word and Copilot is genuinely good at going from a brief description to a structured first draft, especially for business documents that follow predictable formats.

Data analysis in Excel. For people who use Excel regularly but are not formula experts, being able to ask a plain-language question about your data and get an accurate answer is a meaningful capability upgrade.

Meeting summaries in Teams. If your team uses Teams for meetings, the automatic summaries and action item extraction are among the most time-saving features in the entire Microsoft 365 suite.

Want to go deeper?

To understand the full range of what AI agents can do across different tools, check out our guide on top AI agent use cases with example prompts. If you are deciding which AI plan is worth paying for, our comparison of the major AI chatbot plans breaks down the options side by side.