Copilot readiness is a permissions review
Microsoft 365 Copilot can help users locate, summarize and draft from information they are already permitted to reach. A law firm should review its Microsoft 365 environment before broad rollout—not after a sensitive file appears in a response.
For a law firm, Microsoft 365 may contain email, calendars, shared mailboxes, OneDrive files, SharePoint libraries, Teams messages, templates, closing materials, administrative records and client-related work product. Copilot can be useful, but it should be treated as a new way to interact with an existing information environment.
Microsoft’s guidance explains that Microsoft 365 Copilot respects existing user permissions. It is not intended to grant a person access they did not already have. The operational problem is that older oversharing, broad groups and unclear site ownership can become easier to search and surface. See Microsoft’s Copilot privacy and security guidance.
What to review before enabling Copilot broadly
OneDrive and SharePoint sharing
Review external sharing settings, “anyone with the link” sharing, broad internal links and folders that have accumulated access over time. Confirm who owns important sites and libraries, whether access is still required, and whether former staff or external collaborators retain permissions.
Groups and shared mailboxes
Groups simplify collaboration, but stale membership can create access that no longer matches a person’s role. Review shared mailboxes, distribution lists, Teams membership and Microsoft 365 groups around client-facing or sensitive operational work.
Client-file boundaries
A firm should know where active and closed matter records are stored, who can access them and how exceptions are managed. Not every client file needs identical access, but the firm needs a deliberate model rather than a collection of inherited folders and old links.
Tenant, administrator and recovery control
Copilot is one part of a Microsoft 365 tenant. Confirm the law firm owns the tenant, has more than one appropriate administrator, controls recovery methods, maintains a current vendor escalation path and can regain access if a key person or provider is unavailable. This is a core Break-Glass Readiness question.
Approved use cases and human review
Start with a small number of approved uses. For each, decide what information is involved, which users are authorized, what output may be used for and who reviews it. Do not make Copilot a shortcut around the firm’s normal review, file-management or client-communication practices.
A sensible first rollout
- Inventory the Microsoft 365 locations and file types likely to be in scope.
- Review high-risk sharing, broad groups and ownerless sites.
- Confirm firm-owned administration, MFA and emergency recovery paths.
- Choose a limited pilot group and low-risk use cases.
- Give staff a written rule for client information, output review and reporting concerns.
- Review findings before expanding access or adding connectors, agents or automations.
For a smaller firm, this does not require a large Microsoft project. It does require someone to own the decision and evidence the basic facts: who can see what, who can administer the tenant, where the sensitive information sits and how the firm can act if normal access fails.
Do not separate Copilot from the wider law-firm operating environment
A Copilot decision intersects with file governance, external sharing, client confidentiality, offboarding, backups, retention, vendor dependencies and incident response. A firm that cannot identify its critical Microsoft 365 owners, recovery paths and permissions will struggle to explain how AI-assisted access is controlled.
Use this page with CyberTECT’s general OneDrive and SharePoint sharing guide, client-information AI guide and law-firm AI pillar.
Related CyberTECT guidance
Authoritative sources and further guidance
- Microsoft Learn — Microsoft 365 Copilot privacy and security
- Microsoft Learn — Permissions and access considerations for Copilot
- Law Society of Ontario — Using technology
General information only. This article does not provide legal, privacy or professional-conduct advice, determine privilege or confidentiality obligations, or certify Law Society compliance.
CyberTECT resources provide general operational guidance. They do not replace advice specific to your legal, regulatory, contractual or technical circumstances.