Microsoft Copilot can access every file a user has permission to see - which means misconfigured SharePoint permissions become an AI risk. This guide explains the specific governance steps Toronto IT leaders need to take before and after Copilot deployment.
Governing Microsoft Copilot in Your Toronto Business: What IT Leaders Need to Know
Microsoft Copilot for Microsoft 365 is the most widely deployed enterprise AI tool in the GTA. If your organization has Microsoft 365 Business Premium or E3/E5 licences, Copilot is either already available or a licence upgrade away.
The pitch is compelling: Copilot drafts emails, summarizes long documents, generates meeting notes, writes code, and answers questions about your organization's own content. For many GTA businesses, the productivity gains are real.
The governance risk is equally real - and significantly underestimated.
This guide explains precisely what Copilot can access, what goes wrong when permissions are misconfigured, and what governance steps Toronto IT leaders should take before and after Copilot deployment.
What Copilot Can Actually Access
Microsoft Copilot for Microsoft 365 uses your organization's Microsoft Graph to retrieve relevant content when answering prompts. In practical terms, this means Copilot can access:
- Everything in SharePoint and OneDrive that the user has permission to view
- All emails and calendar events in the user's Exchange mailbox
- All Teams chats and meeting recordings the user has access to
- All documents the user has recently worked on across Microsoft 365
Copilot does not create new access. It uses existing permissions. But "existing permissions" is the problem.
Most GTA organizations that deployed SharePoint and OneDrive over the past 5 to 10 years did so without anticipating that a powerful AI assistant would one day be able to surface any document a user has permission to see. Permissions crept over time - files shared broadly for one-time projects were never restricted back, site-wide read access was granted for convenience and never reviewed, former employees' OneDrive content was migrated without permission cleanup.
When Copilot is added to this environment, it can surface documents that users technically have permission to access but would never have thought to look for - including confidential HR records, executive compensation documents, legal advice files, and client data from other departments.
Three Governance Failures We See in Toronto Copilot Deployments
1. Over-broad SharePoint permissions surfacing sensitive content
A common pattern: a department SharePoint site has site-visitor access granted to "All Company" for one folder years ago. That setting persisted and now applies to the entire site. Copilot can surface content from that site to anyone in the company, including documents that were never intended for broad access.
2. Sensitivity labels not applied to confidential documents
Microsoft Purview sensitivity labels are an important tool for signalling which content Copilot should treat as restricted. When DLP policies are configured to act on label classifications, Copilot can be instructed not to include that content in responses. However, labels work alongside - not as a substitute for - proper SharePoint permission controls. Content that a user has broad SharePoint access to may still surface through Copilot even with labels applied, unless permissions have also been properly scoped. The most effective Copilot governance uses both sensitivity labels and SharePoint permission controls together.
3. Audit logging not enabled
Without Microsoft Purview audit logging configured for Copilot activity, you have no record of what your employees asked Copilot, what documents it retrieved, and what content it summarized. For regulated industries in Ontario, this audit gap is a compliance failure.
Copilot Governance: What to Do Before Deployment
If Copilot has not yet been deployed in your organization, the pre-deployment governance steps are:
Step 1: SharePoint permission audit
Review site-level, library-level, and document-level permissions across your SharePoint environment. Identify content that has broader access than intended. Restrict permissions before Copilot is enabled so the AI assistant inherits a clean permission structure.
Step 2: Sensitivity label deployment
Deploy Microsoft Purview sensitivity labels across your Microsoft 365 environment. At minimum, label your Confidential and Highly Confidential content. Configure label-based DLP policies to restrict Copilot from surfacing labelled content - and critically, ensure that the underlying SharePoint permissions for that content are also properly scoped. Labels and DLP policies provide the strongest protection when paired with correct permission boundaries; relying on labels alone while permissions remain too broad leaves a gap.
Step 3: Acceptable use policy
Write and distribute a Copilot-specific acceptable use policy before enabling the feature. The policy should specify what Copilot is approved for (summarizing meeting notes, drafting internal communications, researching internal documentation), what is prohibited (inputting client health information into Copilot prompts, using Copilot to process legal privileged documents, using Copilot-generated content as final without human review), and how to report a concern.
Step 4: Audit logging configuration
Enable Microsoft Purview audit logging for Copilot interactions before the first user session. Audit logs cannot be retroactively generated for sessions that occurred before logging was enabled.
Copilot Governance: What to Do After Deployment
If Copilot is already deployed, the post-deployment governance steps follow the same logic but must work around existing usage:
Immediate priority - audit logging: If not already enabled, enable Purview audit logging immediately. Every day without it is a compliance gap that cannot be closed retroactively.
Permission review within 30 days: Conduct a permission audit across SharePoint. Use Microsoft 365 admin tools or a third-party access review solution to identify overly broad permissions and remediate them.
Sensitivity labelling within 60 days: Deploy sensitivity labels to your confidential content. This can be done incrementally - start with the highest-risk content categories and expand coverage over 60 to 90 days.
Acceptable use policy within 30 days: Distribute a Copilot acceptable use policy to all users with Copilot licences. For regulated industries, get written acknowledgment from each employee.
Group 4 Networks' AI Governance service includes Copilot-specific governance as a core component. We assess your current SharePoint permission structure, deploy sensitivity labels appropriate to your industry's regulatory requirements, configure Purview audit logging, and develop a Copilot acceptable use policy aligned with PHIPA, PIPEDA, or LSO guidance as applicable.
Our Microsoft 365 services team handles the technical implementation. Our governance team handles the policy and compliance layer. Both work together as a single engagement.
Copilot Governance for Regulated Industries in Toronto
Healthcare organizations (PHIPA): Patient health information in SharePoint or OneDrive must be classified and label-restricted to prevent Copilot from surfacing it in response to prompts from staff without a clinical need to know. PHIPA requires documented access controls for personal health information - Copilot access controls must be included in that documentation.
Law firms (LSO technology competence): Copilot access to client matter files raises solicitor-client privilege considerations. Matter files should be permission-restricted to the working team, and Copilot acceptable use rules should specifically address the prohibition on using AI to process communications protected by privilege without client consent.
Financial services firms (PIPEDA, OSFI B-13 for larger firms): Client financial records and PII in SharePoint must be classified and access-controlled. Copilot audit logs should be reviewed as part of your regular access review cycle to detect anomalous retrieval patterns.
Frequently Asked Questions
Does Microsoft Copilot share data between organizations?
No. Microsoft Copilot for Microsoft 365 is a tenant-isolated service. Microsoft has committed that data submitted through Copilot for Microsoft 365 is not used to train the underlying models, and Copilot cannot access content from other tenants. Data residency for Canadian organizations depends on your specific Microsoft 365 subscription type, tenant configuration, and the Microsoft data residency commitments applicable to your plan. Organizations with PHIPA or other data-residency obligations should confirm their specific data residency configuration directly with Microsoft or a Microsoft-certified IT provider. Group 4 Networks can help verify your organization's data residency posture as part of a Copilot governance engagement.
Can we restrict Copilot to specific users or departments while we complete governance work?
Yes. Microsoft 365 Copilot licences are assigned at the user level. You can deploy Copilot to a pilot group - typically IT and a controlled business unit - while permission remediation, sensitivity labelling, and policy work is completed across the full environment. Group 4 Networks recommends this phased approach for organizations that need Copilot capabilities while governance is still being implemented.
What Microsoft Purview features are required for Copilot governance?
The minimum Purview features for Copilot governance are: Audit (Standard or Premium) for logging Copilot interactions, Sensitivity Labels for classifying and restricting access to confidential content, and Data Loss Prevention for preventing sensitive data from being processed outside approved boundaries. Communication Compliance and Insider Risk Management (available in higher licence tiers) add additional monitoring capabilities for regulated environments.
What is the compliance risk if Copilot accesses PHIPA-protected information without governance controls?
If Copilot can surface personal health information in response to prompts from staff without a clinical need to know - because SharePoint permissions are too broad or sensitivity labels are not applied - that constitutes an unauthorized access to personal health information under PHIPA. Even if no data leaves the organization, unauthorized internal access to personal health information by individuals without a clinical need to know is a privacy risk that should be assessed against PHIPA requirements. Whether notification obligations arise depends on the specific facts and a legal assessment; organizations should consult their privacy counsel when evaluating potential incidents. The Information and Privacy Commissioner of Ontario has confirmed that AI tool access to PHI is subject to the same access controls as direct human access.
How does Group 4 Networks help with Microsoft Copilot governance?
Group 4 Networks implements Copilot governance as a combined technical and policy engagement. Our Microsoft 365 team conducts the SharePoint permission audit, deploys sensitivity labels appropriate to your industry and regulatory requirements, configures Purview audit logging, and applies Entra ID Conditional Access policies for Copilot access. Our governance team develops the acceptable use policy, conducts employee training, and sets up quarterly governance reviews. Contact us at (416) 623-9677 or book a free assessment.