Cloud & Microsoft 365
Deploying Microsoft Copilot across your organisation is exciting—but it's also a risk amplifier. If your SharePoint permissions management strategy isn't robust, you could inadvertently expose sensitive client data, financial records, or privileged communications to staff members who shouldn't access them. Before you roll out Copilot, you need to audit, tighten, and document your permission structures. This guide walks you through the practical steps that London SMBs, professional services firms, and legal practices should take now.
Copilot in Microsoft 365 works within the boundaries of your existing permissions. That sounds reassuring—and it should be—but it also means Copilot will surface information that users are already authorised to see, just faster and in new ways.
Consider a partner at a legal practice who runs a broad search via Copilot. The AI will pull from all documents they have access to, including files shared inadvertently with them, inherited from old team memberships, or sitting in a general shared library. Without disciplined SharePoint permissions management, Copilot becomes a spotlight on your messiest data governance problems.
For professional services and financial advisory firms, this is particularly acute. You're managing client-sensitive work, regulatory obligations (FCA, SRA, or GDPR constraints), and competitive intelligence. A poorly configured permission set doesn't just risk a compliance breach—it can undermine client trust and create legal liability.
The good news: Copilot also gives you an incentive to clean up SharePoint. By the time you've tightened permissions, you'll have better visibility of where sensitive data lives, who should access it, and why.
You can't secure what you don't understand. Your first task is to map your current state.
Walk through your SharePoint estate and mark libraries that hold:
Use a simple spreadsheet to document each site or library, its business purpose, and who should legitimately access it. If you're unsure, that's a warning sign—it means the site was probably created ad hoc and has drifted from its original governance.
SharePoint permissions are inherited by default. A new file inherits the library's permission set; a new library inherits the site's permission set. Over time, this creates sprawl:
Microsoft 365 has built-in tools to help. Use the SharePoint admin centre to review site permissions, or export a report of users and their roles across your sites. Many firms find they can reduce their active permission sets by 20–30% through this exercise alone.
Check whether individual files or folders have been shared directly with users outside their parent library's permission structure. This is often invisible to site owners and creates "surprise" access. Use the "Manage Access" feature in SharePoint to view all users with direct file-level permissions and understand why they were granted.
Once you've audited, move to a structured permission model. Role-based access control (RBAC) assigns permissions based on job function, not individual need, making the system scalable and auditable.
Examples for a legal practice might include:
For financial advisory or professional services, adjust the roles to reflect your practice structure. The key is specificity: roles should align with how work actually flows in your organisation.
Use Microsoft 365 groups, Azure AD security groups, or SharePoint groups to bundle users by role. This way, when someone joins or changes role, you update their group membership rather than manually adjusting dozens of individual permissions. It's faster, less error-prone, and leaves an audit trail.
Grant the minimum permissions necessary for someone to do their job. A user who reads documents doesn't need editing rights; a team member who contributes to one project doesn't need access to all projects. This principle is both a security best practice and a compliance expectation under UK data protection law.
Solid permissions mean little if no one remembers why they're set that way. Before launch, document and govern your structure.
Build a simple table showing which roles have which permission levels (View, Edit, Contribute, Manage) on which libraries or site collections. Share this with stakeholders, especially partners or directors, so everyone understands the rationale. Include a review date—ideally quarterly for sensitive areas.
When someone needs special access or a new library is created, require a brief request form: who needs access, to what, why, for how long? This slows you down just enough to catch ad hoc mistakes and gives you a record for audits. If you're managing multiple teams or offices, consider a centralised IT helpdesk or governance panel to avoid inconsistency.
Permissions degrade over time as people move departments, leave the firm, or take on new responsibilities. Set a reminder to review your RBAC structure and actual assignments every six months. For highly sensitive data—client matters, financial records—review quarterly. After rolling out Copilot, schedule a post-launch review at 30, 90, and 180 days to catch any unexpected data discovery patterns.
A properly governed SharePoint estate is the foundation of safe, confident AI adoption. When your team knows that Copilot will only surface information they're supposed to see, adoption accelerates and everyone—clients, partners, and regulators—can trust the system. If you're navigating this for the first time or feel your current permission structure has become unmanageable, that's where a structured review with a partner like VantagePoint Networks can give you clarity and a roadmap. The investment in getting permissions right now will pay dividends through smoother Copilot deployment, better compliance, and fewer data governance headaches down the line.
VantagePoint Networks is an independent senior IT and AI consultancy based in London. No account managers — every engagement is handled directly by the founder.
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