3,500 attorneys
AmLaw 100 Law Firm: Microsoft Copilot Deployment
How an AmLaw 100 law firm deployed Microsoft 365 Copilot across 3,500 attorneys with zero privilege breaches, 67% faster document review, and 12% billable hour recovery.
67% Reduction
Document Review Time
Zero
Privilege Breaches
78%
Attorney Adoption
12% Increase
Billable Hour Recovery
Client Overview
Industry
Legal
Company Size
3,500 attorneys plus 2,000 support staff
Location
United States (12 offices)
Timeline
8-month phased deployment
Products & Technologies
The Challenge
Attorney-client privilege protection was non-negotiable. Microsoft Copilot could not surface documents from one client matter in responses to another. Existing SharePoint permissions were overly broad, and conflict-checking processes had gaps that AI could exploit.
The Solution
Conducted a full matter-level permissions audit across 180,000 SharePoint sites. Implemented strict matter segregation using sensitivity labels and information barriers. Deployed Copilot with custom Restricted SharePoint Search scoping to prevent cross-matter data leakage. Built privilege-aware prompt guardrails for all AI interactions.
Key Results
67% Reduction
Document Review Time
Zero
Privilege Breaches
78%
Attorney Adoption
12% Increase
Billable Hour Recovery
“The matter-level permissions audit alone was worth the entire engagement. We discovered cross-matter exposure risks across 180,000 sites that would have been catastrophic with AI surfacing that data to opposing counsel teams.”
Chief Information Security Officer, AmLaw 100 Firm
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