Major Bank Hardens Copilot Rollout Before Production
How a major bank halted a Microsoft 365 Copilot rollout, ran an AI Posture Check plus paid Standard Audit, fixed the permissions and DLP gaps, and shipped Copilot across the workforce 8 weeks later with documented OSFI B-13 evidence.
North American bank, 20,000 employees, multi-province
Challenge
The bank's CISO was under pressure to enable Microsoft 365 Copilot for 20,000 employees. The rollout team had pinpointed Q4 launch. The CISO ran a Posture Check that scored Foundation in the Data dimension and Developing overall. The implication was clear: launch as-planned and Copilot would surface SharePoint over-sharing the bank had never inventoried. OSFI B-13 audit risk plus reputational risk. Launch was paused.
What CWS did
CWS ran a paid Standard Audit focused on the Data and Vendor dimensions. Output: a permissions cleanup plan, Microsoft Purview deployment plan, audit-logging configuration, and OSFI B-13 evidence template. The bank executed. Copilot launched 8 weeks later with documented controls.
Outcome
20,000 users on Copilot. Zero documented sensitive-data leaks in the first 90 days. OSFI B-13 evidence accepted by internal compliance and external auditors.
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