Microsoft Copilot Security: What Businesses Need to Know Before Rolling It Out

Artificial intelligence is quickly becoming a standard part of the modern workplace, and Microsoft Copilot is leading the way for organizations that already utilize Microsoft 365. From drafting emails and summarizing meetings to analyzing spreadsheets and generating reports, Copilot has the potential to significantly improve employee productivity.

However, as with any new technology, its important to evaluate your Microsoft Copilot security posture before enabling it across your organization. While Copilot doesn't create new security risks on its own, it can reveal existing security gaps that businesses don't realize they have.

Here's what every business needs to know before rolling out Microsoft Copilot:

How Microsoft Copilot Accesses Your Data

One of the biggest misconceptions about Copilot is that it can access all of your company's data. In reality, Copilot only retrieves data that an individual user has permission to access through Microsoft 365.

That includes information stored in applications like:

• Outlook

• Microsoft Teams

• SharePoint

• OneDrive

• Word

• Excel

• PowerPoint

If an employee can access a document manually, Copilot can use that document to generate responses and assist with tasks.

Microsoft Copilot security starts with your existing permissions, not the AI itself.

Hidden Permission Issues Become a Bigger Problem

Many organizations have accumulated years of shared folders, outdated permissions, and open SharePoint sites.

Employees may have access to:

• HR documents

• Financial reports

• Payroll information

• Customer contracts

• Executive planning documents

• Confidential project files

Before Copilot, employees would likely never search through thousands of files to find this information, but Copilot makes discovering information way easier.

For example, an employee could ask: "Summarize our customer contracts from the last year."

If they already have permission to those documents, Copilot can quickly compile that information.

This is why reviewing permissions should be the first step before deployment.

Clean Up SharePoint and OneDrive Permissions

Many businesses have spent years creating folders, moving files, and granting temporary access without ever reviewing permissions.

Before implementing Copilot for your team, you should:

• Remove unnecessary

• Review shared folders

• Eliminate orphaned permissions

• Archive outdated files

• Verify department level security groups

The cleaner your Microsoft 365 environment is, the more secure your Copilot

AI-powered security tools can detect suspicious activity faster than ever before, but someone still has to investigate alerts, respond to incidents, and make critical security decisions.

When a ransomware attack occurs or unusual network activity is detected, businesses need experienced IT professionals who can:

• Investigate what happened

• Contain the threat

• Recover affected systems

• Communicate with leadership

• Strengthen defenses to prevent a future attack

AI can assist with these processes, but it cannot replace experienced cybersecurity professionals.

Establish an AI Usage Policy

Technology alone isn't enough.

Employees need clear guidelines on how AI should be used within your organization.

A good AI policy should address:

• What information can be entered into AI tools

• When Copilot should be used

• Handling confidential customer data

• Reviewing AI-generated content before sharing

• Responsible use of AI-generated summaries and recommendations

  
  

Training employees helps reduce risk while encouraging productive use of AI.

Protect Sensitive Data with Microsoft Purview

Microsoft offers several tools that help strengthen the security of Microsoft Copilot, including Microsoft Purview.

Purview can help organizations:

• Classify sensitive information

• Apply sensitivity labels

• Prevent unauthorized

• Control data loss through Data Loss Prevention (DLP) policies

• Improve visibility into how data is accessed

When properly configured, these tools help ensure Copilot only works with data that is appropriately protected.

Strengthen Identity Security

Since Copilot uses a user's Microsoft 365 permissions, securing user accounts becomes even more important.

Businesses should ensure they have:

• Multi-factor authentication

• Strong password policies

• Conditional Access policies

• Role-based access controls

• Regular account reviews

• Prompt removal of previous employee accounts

Identity security remains one of the most effective ways to reduce cybersecurity risks overall.

Monitor for Oversharing

Even after deployment, businesses should continuously monitor their Microsoft environment.

Regular reviews should include:

• New SharePoint sites

• Publicly shared files

• Guest user access

• Permission changes

• Data classification compliance

Microsoft Copilot often shines a light on security issues that have existed for years but were previously unnoticed.

Don't Forget About Employee Training

Even with strong technical controls, employees play a critical role in maintaining security.

Training should cover:

• Recognizing sensitive information

• Proper prompting techniques

• Verifying AI-generated content

• Avoiding accidental disclosure of confidential information

• Reporting suspicious AI activity or unexpected results

An informed workforce is one of your strongest defenses.

Conduct a Microsoft Copilot Readiness Assessment

Before enabling Microsoft Copilot across your organization its worth taking the time to conduct a structured security readiness assessment. This assessment can help identify existing weaknesses that AI could expose and ensures your Microsoft 365 environment is prepared for a secure rollout.

A security assessment should go beyond checking whether users have licenses assigned, it should evaluate how your data is organized, who has access to it, and whether the proper security controls are in place.

Some of the most important areas to review include:

• Microsoft 365 Permissions:  Verify that users only have access to the files, sites, and mailboxes necessary for their role.

• SharePoint and OneDrive Structure: Look for overshared folders, outdated project sites, broken inheritance, and unnecessary external sharing.

• Microsoft Teams Access: Review team memberships, guest accounts, and channels that may contain confidential information.

• Sensitivity Labels: Confirm that confidential documents are properly classified and protected using Microsoft Purview.

• Data Loss Prevention (DLP): Ensure policies are configured to prevent sensitive information from being shared inappropriately.

• Identity Protection: Verify that Multi-Factor Authentication (MFA), Conditional Access, and role-based access controls are enforced for all users.

• Device Compliance: Confirm that company devices meet security requirements before they can access Microsoft 365 resources.

• Audit Logging and Monitoring: Make sure auditing is enabled so administrators can investigate unusual activity and understand how data is being accessed.

Many organizations are surprised by what they discover during this process. Over the years, employees change roles, departments merge, projects end, and temporary permissions become permanent. Without regular reviews, these outdated permissions accumulate and create unnecessary security risks.

A readiness assessment also provides an opportunity to improve overall data governance. Cleaning up duplicate files, removing obsolete documents, archiving inactive content, and organizing SharePoint sites not only improves security but also makes Copilot more effective. When your Microsoft 365 environment is well organized, Copilot can deliver more accurate and relevant responses because it works from cleaner and more reliable information.

Finally, keep in mind that Microsoft Copilot isn't just a one-time project. As your organization grows, employees join and leave, new departments are created, and additional data is added to Microsoft 365. Periodic security reviews help ensure permissions remain appropriate and your AI tools continue operating within a secure, well-managed environment.

Microsoft Copilot Can Improve Productivity When Its Properly Secured

Microsoft Copilot has the potential to transform how businesses operate by helping employees save time, automate repetitive tasks, and find information more efficiently.

But truly successful adoption relies on strong Microsoft Copilot security practices.

By reviewing permissions, organizing your Microsoft 365 environment, implementing governance policies, protecting sensitive data, and educating employees, businesses can confidently take advantage of AI while reducing unnecessary risks.

Rather than viewing security as a barrier to AI adoption, think of it as the foundation that allows your organization to use Microsoft Copilot safely and effectively.

Ready to Prepare Your Business for Microsoft Copilot?

Before enabling Microsoft Copilot across your organization, make sure your Microsoft 365 environment is ready. At Encompass IT, we help local businesses assess permissions, strengthen security, implement governance policies, and ensure Microsoft Copilot is deployed safely and effectively.

Contact Encompass IT today to schedule a Microsoft 365 security assessment and discover how you can embrace AI with confidence.