If you’ve been wondering about Microsoft Copilot data privacy — whether it’s snooping through your files or feeding your business information into some public AI model — you’re not alone. It’s the question I get asked more than any other. So let me give you the straight answers, without the tech jargon.
First, What Can Copilot Actually See?
This depends entirely on which version you’re using, and the differences are significant.
The free version at copilot.microsoft.com can only see what you type into the chat and what you manually share with it. It has no access to your files, emails, or anything in your Microsoft 365 account whatsoever. It’s completely separate.
Copilot Chat — the version included with most Microsoft 365 business subscriptions — is more capable than I originally thought, and I’ll be honest, this surprised me.
It can see files you have open on screen, emails you’ve selected in Outlook on the web, and anything you paste or share directly into the chat. But when I tested it recently with a completely blank document, it told me it could also search files stored in my OneDrive and SharePoint when I ask about them.
So while it isn’t automatically scanning everything in the background, it does appear to have broader access than I originally described. The good news is that it still only searches your files when you ask it to — it’s not doing anything without your prompting.
The paid Microsoft 365 Copilot (around £16 per month) is a different story. It can access everything in your Microsoft 365 environment that you have permission to access — OneDrive, SharePoint, Outlook, Teams. If you can open it, Copilot can see it.
So Where Does Your Data Actually Go?
This is a big one. No, your data is not going to OpenAI’s public servers. It’s not training ChatGPT. Here’s what actually happens.
When you use Copilot, your request goes to Microsoft’s Azure OpenAI service — that’s Microsoft’s own private, enterprise version of the AI, running on Microsoft’s infrastructure. For UK customers like me, that means UK or European data centres.
Your data is encrypted in transit (scrambled so nobody can intercept it) and when it’s stored. Once Copilot has answered your question, that’s it. Microsoft explicitly states in their terms of service that your data is not used to train their AI models.
They know businesses won’t use it otherwise. And frankly, they’ve got everything to lose if they get that wrong.
What Microsoft Does to Protect You
Microsoft takes security seriously — they have to. Here’s what’s in place:
Encryption both in transit and at rest is standard. They comply with GDPR, ISO standards, and SOC 2 (industry security certifications that matter if you’re in a regulated field like healthcare, finance, or legal). Every Copilot interaction is logged in audit trails, so you can see who used it, when, and what files were accessed. And your Microsoft 365 admin — which might be you — can turn Copilot off, restrict it to certain users, or disable features entirely.
Here’s the Bit Most People Miss
And this applies to Copilot Chat users too — not just those on the paid licence.
Microsoft isn’t actually the risk you need to worry about. Your own file permissions are.
Picture this: six months ago you shared a document containing client pricing with your team. The project ended, everyone moved on, but the file is still accessible to the whole team. Now someone asks the paid version of Copilot about pricing. It finds that file — because it’s technically accessible — and uses the information in its answer.
Copilot didn’t do anything wrong. The file was already overshared. Copilot just made that problem very visible, very quickly.
What To Do Before You Start Using Copilot
A bit of housekeeping goes a long way — and this applies whether you’re on the free included Copilot Chat or the paid version.
Here’s what I’d recommend:
Audit your SharePoint permissions. Check who can access what across your sites. If everyone can see everything, that needs tidying up before you switch Copilot on.
Check your OneDrive sharing. What have you shared externally? What’s shared internally with the whole team? Sensitive files should be private unless there’s a good reason otherwise.
Pay attention to your spreadsheets. Excel files are where the financial data, client lists, and pricing usually live. Know where they are and who can access them.
Use sensitivity labels if you handle confidential data. Microsoft lets you mark files as Confidential or Internal Only, and Copilot respects these labels. If you deal with GDPR-covered data, this is worth setting up.
My Practical Advice
If you’re using the free or included Copilot Chat, the risk is genuinely low. You control what it sees, nothing happens automatically, and as long as you’re not pasting in passwords or truly sensitive client data while you’re testing it out, you’ll be fine.
If you’re considering the paid version, complete that permissions audit first. Spend an afternoon (or more) on it. It’s worth it!
Think of Copilot a bit like a new member of staff. You wouldn’t give them access to everything on day one, and you’d have a conversation about confidentiality. The same principle applies here.
A one-off is only good at the beginning, so make it a regular task – monthly or quarterly – for file owners to review what, how and to whom files are shared. It’s better to be continuously reviewing this, rather than getting hit with problems down the line.
And if you’re a new business – start with this in mind. Create recurring tasks to review file sharing. Design practices to really consider who needs and should access this.
The Bottom Line
When it comes to Microsoft Copilot data privacy, the answer is reassuring — your data isn’t being stolen or used to train public AI. Your data isn’t being stolen or used to train public AI. It’s processed securely within Microsoft’s own infrastructure. The thing to focus on is your own file management — make sure sensitive information isn’t sitting around accessible to people who don’t need it.
Sort that out, and Copilot is as safe as the rest of Microsoft 365. Don’t let the fear of something new stop you from using a tool that could genuinely save you hours every week.
Written with the help of Claude AI from an original transcription.
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