Yes, with one condition: Microsoft 365 Copilot only sees what each user can already access, so the real risk is oversharing that already exists inside your tenant, not the AI itself. Microsoft does not use your prompts, responses or files to train its AI models, and your data stays inside the Microsoft 365 service boundary.
That is the short version. The longer version matters because Copilot is usually the first AI purchase a business makes, and the questions that stall the decision are almost always the same three: does Microsoft learn from our data, can staff see things they shouldn't, and where does it all physically live? This guide answers each one in plain English, then finishes with the five checks Frontrow runs before any client switches Copilot on.
Does Microsoft train AI on my company's data?
No. For commercial Microsoft 365 tenants, your prompts, Copilot's responses, and any business content Copilot reads along the way are not used to train the foundation models (the large AI models that power Copilot). Microsoft states this explicitly in its Copilot privacy documentation, and it applies whether the content comes from Outlook, Word, Excel, Teams or SharePoint. Even the feedback your staff submit through the thumbs-up and thumbs-down buttons is excluded from model training.
Just as importantly, this is a contractual commitment, not a settings toggle someone can miss. Copilot is covered by the same enterprise terms that already protect your email in Exchange and your files in SharePoint, under what Microsoft calls enterprise data protection. If your business was comfortable putting its email in Microsoft 365, the data-handling promise behind Copilot is the same one, extended to AI.
One caution for completeness: these protections apply when staff are signed in with their work account. A team member using a free consumer AI chatbot on their personal login gets none of them. Part of Copilot's value is that it gives staff a sanctioned tool, which reduces the temptation to paste company information into unmanaged ones.
Can Copilot show staff files they shouldn't see?
Copilot cannot open any door that was closed to the user. Every Copilot query runs under the identity of the person asking, and it can only retrieve content that person could already open themselves in SharePoint, OneDrive, Teams or their own mailbox. There is no master key and no behind-the-scenes account with wider access.
Here is the honest catch, and it is the single most important sentence in this guide: Copilot can only show what a user already has access to, but in most organisations, staff have access to far more than anyone realises. A payroll spreadsheet shared to the whole company in 2021, an HR folder on a site nobody remembers, a link set to "anyone in the organisation" and forwarded around. Before Copilot, that content was technically reachable but practically invisible, because nobody went looking. Copilot answers questions in seconds, so it surfaces those old mistakes at conversational speed.
"Copilot doesn't create a data problem. It publishes the one you already had."
The fix is not a Copilot setting. It is permissions hygiene: finding overshared content and re-scoping it before rollout. Frontrow has published two deeper technical guides on exactly how Copilot inherits SharePoint permissions and how to remediate the trap, so this article stays at the level a business owner needs. The takeaway is simply that this risk is real, well understood, and entirely fixable in a few weeks of focused work.
Where does Copilot data go?
Your prompts, Copilot's responses and the history of those interactions are treated as customer data inside the Microsoft 365 service boundary (the contractual fence around the Microsoft 365 services your organisation already uses). They are encrypted at rest, they respect your retention policies (the rules that control how long content is kept), they can be searched in legal discovery, and every interaction can be audited. Nothing is sold, shared with advertisers, or passed to other Microsoft customers, and tenants are isolated from one another so another company's Copilot can never see your content.
For Australian businesses there is a genuine residency story. If your tenant is provisioned in Australia, Copilot interaction content and the semantic index (Copilot's map of your content) are stored at rest in Microsoft's Australian datacentres, in line with your existing Microsoft 365 residency commitments. Microsoft has also announced in-country processing for Copilot, with local processing of Copilot interactions expected to reach Australia by the end of 2026. Until that lands, the AI processing step may occur in overseas Microsoft datacentres under the same contractual protections, so if a regulator or client contract cares about where data is processed rather than stored, verify the current commitment in the Microsoft Product Terms before you sign.
What should we fix before turning it on?
A safe Copilot rollout is mostly preparation. None of it is exotic, and most of the tooling is included with the Copilot licence itself. Here is the pre-flight list Frontrow works through with clients.
5 things to check before switching Copilot on
- 1Run the oversharing reports. SharePoint Advanced Management (included with a Microsoft 365 Copilot licence) produces data access governance reports that list sites shared with "Everyone" or with links anyone in the company can use. This is your map of what Copilot could surface on day one.
- 2Fix the worst sites first. Re-scope membership on the sites holding payroll, HR, board and commercial content, and remove company-wide sharing links. You do not need a perfect tenant, you need the sensitive ten percent locked down.
- 3Apply sensitivity labels to genuinely confidential content. Labels (tags such as "Confidential" that travel with a file) are honoured by Copilot, and Microsoft Purview data loss prevention policies can exclude labelled files from Copilot processing entirely.
- 4Set your pilot guardrails. Start with a small group of licensed users rather than the whole company. Note that Restricted SharePoint Search, Microsoft's earlier stop-gap that limited Copilot to an allow-list of sites, is being retired with new enablement blocked from 31 July 2026, so plan around permission fixes and Restricted Content Discovery (a per-site switch that hides a site from Copilot and search) instead.
- 5Turn on auditing and brief your staff. Confirm Copilot interactions appear in your audit log, decide retention settings, and give staff a one-page acceptable-use note so expectations are set before the first prompt.
For a typical Australian small or mid-sized business, this preparation is a matter of weeks, not months, and every step improves your security posture whether or not you proceed with Copilot. That is the reframe worth ending on: the checklist above is not AI-specific busywork, it is the tenant hygiene Microsoft has recommended for years, with Copilot providing the deadline.
Frontrow Technology runs Copilot readiness assessments for Australian businesses, including the oversharing scan, remediation plan and pilot design described above. If the questions in this guide are the ones holding up your decision, that assessment answers them with your own tenant's data rather than generalities.