29 years Microsoft consulting11,000+ enterprise engagementsMicrosoft Press bestselling author
Last updated June 11, 2026 by Errin O'Connor, Founder & Chief AI Architect, EPC Group
Draft — Pending Engagement Confirmation
Five named reference patterns templated below. Each [VERIFY] metric requires Errin O'Connor's real numbers from the corresponding engagement before public publication. Page is currently noindex,nofollow and excluded from sitemap until D4 confirmed.
Five named reference patterns from EPC Group's 11,000+ engagements, each with architecture and quantified outcomes: the large-user regulated Power BI rollout, the multi-tenant M&A consolidation, the stalled-GSI rescue, the HIPAA-native Fabric lakehouse, and the 90-day Copilot hardening. Patterns, not anecdotes — because the third time you've solved a problem, it's a method.
Case studies tell you a story happened once. Patterns tell you it's repeatable. These five are anonymized where confidentiality requires — the architectures and the numbers are real.
Pattern 1 — The Regulated Large-User Power BI Rollout
Situation: A regulated enterprise needed governed self-service analytics for [VERIFY: N]+ users across [VERIFY: N] business units, under HIPAA and SOC 2.
Architecture: Governance-first workspace topology, RLS by organizational hierarchy, certified semantic models, Purview lineage end-to-end, phased wave deployment with adoption telemetry.
[VERIFY: N]+ users
live in production
[VERIFY: 0]
critical audit findings
[VERIFY: X%]
shadow-reporting reduction
Pattern 2 — The Multi-Tenant M&A Consolidation
Situation: Private-equity-driven acquisition program requiring repeated tenant consolidations on compressed deal timelines.
Architecture: Repeatable wave-based migration factory — identity first, mail/files staged, zero-downtime cutover windows, per-deal runbook. Same senior architects across every wave.
216+ tenants
migrated (2023–2025)
1.83M users
cutover total
[VERIFY: Hours]
average cutover window
Pattern 3 — The Stalled-GSI Rescue
Situation: A Fortune 500 program stalled at [VERIFY: %] complete after [VERIFY: months] with a global integrator; executive sponsor needed shipped milestones, not a re-discovery phase.
Architecture: Two-week triage assessment → re-baselined fixed-fee plan → senior-architect delivery team of [VERIFY: N] replacing a bench of [VERIFY: N+]. Existing artifacts preserved where reusable, replaced where they were the problem.
[VERIFY: X weeks]
to first shipped milestone
[VERIFY: Y%]
under original remaining budget
[VERIFY: Z mo]
completed early / on time
Pattern 4 — The HIPAA-Native Fabric Lakehouse
Situation: A healthcare organization consolidating clinical and operational reporting onto one governed platform.
Architecture: OneLake medallion lakehouse, Direct Lake semantic models, Purview classification with PHI auto-labeling, break-glass access auditing, Fabric F-SKU sized for sustained load with capacity governance.
[VERIFY: TB]
consolidated data volume
[VERIFY: %]
refresh latency improvement
[VERIFY: passed]
audit-readiness metric
Pattern 5 — The 90-Day Copilot Hardening
Situation: Enterprise wanted Copilot deployed; security wanted oversharing fixed first. Both were right.
Architecture: The 30-Day Copilot, Purview & M365 Tenant Hardening Accelerator ($35,000 fixed fee) extended to a 90-day pilot: oversharing remediation, sensitivity labels deployed across high-risk content, pilot cohort telemetry feeding governance refinement.
[VERIFY: N]
sensitivity labels deployed
[VERIFY: K]
oversharing items remediated
[VERIFY: N]
pilot cohort size
Frequently Asked Questions
Yes — anonymized where confidentiality requires; architectures and outcomes are from delivered work. Specific named clients are listed on the Case Studies page when contractually permitted.
