What Is Microsoft Copilot? A Plain-English Explanation

The short answer: Microsoft Copilot is an AI assistant built directly into Windows and Microsoft 365 — so it works inside Outlook, Word, Excel, Teams, and more. If you use Microsoft products at work, Copilot is already close by. Whether it’s already available to you depends on your Microsoft plan.

If you use a Windows computer or work in Microsoft 365, you’ve probably noticed the Copilot name appearing in your apps. Maybe there’s a new button in your toolbar. Maybe IT sent around an announcement. Maybe you just keep hearing it mentioned and have no idea what it actually does.

Here’s the plain-English version.

What Copilot actually is

Microsoft Copilot is an AI assistant — similar in nature to ChatGPT or Claude — but built directly into Microsoft’s products rather than being a separate tool you visit in a browser.

The idea is that instead of switching to a different app to get AI help, it’s right there inside the tools you’re already using. Working in Word? Copilot can draft a document for you. In Outlook? It can summarise an email chain or draft a reply. In Teams? It can recap a meeting you missed.

At its core, it’s powered by the same kind of technology that runs ChatGPT — Microsoft has a major investment in OpenAI, the company that makes ChatGPT, and that relationship shows up in their products.

Where Copilot lives

Copilot shows up in several places, which can make it a bit confusing:

Windows (free): There’s a Copilot button built into Windows 11 — a sidebar AI assistant you can open from the taskbar. It answers questions, helps with computer tasks, and works a bit like a smart search bar for your PC.

Copilot.microsoft.com (free): Microsoft’s standalone Copilot web app, similar to ChatGPT. Free to use, works in your browser, and handles general questions and tasks.

Microsoft 365 Copilot (paid add-on): This is the version that works inside Word, Excel, Outlook, and Teams. It’s more powerful and more integrated — but it’s a paid feature on top of your Microsoft 365 subscription. Not everyone has access to this yet; it depends on your organisation’s plan.

What it can actually do

In Outlook

Summarise long email threads so you can catch up in seconds
Draft replies based on what the email says and your brief instructions
Flag action items from a chain of messages
Adjust tone — make an email more formal or more casual with one click

In Word

Draft documents from a prompt or from notes you give it
Summarise long documents into key takeaways
Rewrite sections to be clearer or more concise
Add content — “expand this section with more detail about X”

In Excel

Explain formulas in plain English
Suggest formulas for what you’re trying to calculate
Highlight trends and anomalies in your data
Create charts from selected data

In Teams

Recap meetings you missed, with key points and action items
Catch you up during a meeting you joined late
Summarise chat threads in channels

How it compares to ChatGPT and Claude

All three use similar AI technology under the hood. The difference is mostly about where you use them:

ChatGPT and Claude are general-purpose AI assistants you visit in a browser — good for everything, but separate from your work tools
Microsoft Copilot is integrated into your Microsoft apps — less flexible in some ways, but much more convenient if you’re already spending your day in Outlook and Word

If you already use Microsoft 365 heavily and your organisation has turned on Copilot, it’s worth learning. If you’re looking for a general-purpose AI assistant, ChatGPT vs Claude covers which of those two is right for you.

How to get started

If you’re on Windows 11, look for the Copilot icon in your taskbar — it may already be there. Click it and try asking it something.

For the web version, go to copilot.microsoft.com and sign in with your Microsoft account (the same one you use for Outlook or OneDrive). It’s free.

For Microsoft 365 Copilot in Word, Excel, and Teams — check with your IT team or look in your Microsoft 365 account settings to see if it’s available on your plan.

Is it actually useful?

For the right person, yes. If you’re in Outlook all morning dealing with emails and in Teams for meetings most of the day, Copilot can genuinely save you time — especially the email summarisation and meeting recap features, which work well.

The Excel formula help is also genuinely useful for people who know what they want to calculate but don’t know the syntax to do it.

Where it’s less impressive is creative or complex tasks — for those, standalone tools like Claude tend to produce better results.

Frequently asked questions

What is Microsoft Copilot? Microsoft Copilot is an AI assistant built into Microsoft’s products — including Windows, Outlook, Word, Excel, Teams, and more. It can draft emails, summarise documents, generate formulas, recap meetings, and assist with a wide range of tasks directly inside the tools you’re already using.

Is Microsoft Copilot free? There’s a free version of Copilot available at copilot.microsoft.com and built into Windows. The more powerful version — Microsoft 365 Copilot — is a paid add-on for Microsoft 365 subscribers that works inside Word, Excel, Outlook, and Teams.

What’s the difference between Microsoft Copilot and ChatGPT? Both use similar underlying AI technology. The main difference is integration: ChatGPT is a standalone tool you visit separately, while Copilot is built into Microsoft’s apps. If you live in Word and Outlook all day, Copilot is more convenient. If you want a general-purpose AI assistant, ChatGPT or Claude works just as well.

Do I need to be technical to use Microsoft Copilot? Not at all. Copilot is designed to work in plain English inside familiar tools. You type what you need — “summarise this email thread”, “draft a reply”, “create a chart from this data” — and it does it.