Case Study: Manufacturing M&A 3-Tenant Consolidation

Case Study: Manufacturing [Microsoft 365](/services/microsoft-365-consulting) M&A Consolidation — 3 Tenants (2026)

This case study illustrates the operational outcomes of a Fortune 500 industrial manufacturer's Microsoft 365 tenant-to-tenant consolidation following multi-acquisition activity — driven by Microsoft Fabric OT/IT analytics, SAP integration, Microsoft Defender for IoT deployment, and Microsoft 365 Copilot governance.

EPC Group has delivered Microsoft 365 tenant consolidations for Fortune 500 manufacturing organizations since the original Microsoft 365 era (2014).

Customer Profile

• Fortune 500 industrial manufacturer
• 30,000+ employees globally
• 60+ manufacturing facilities globally
• 3 source Microsoft 365 tenants from acquisition activity
• SAP S/4HANA + Wonderware + OSI PI + Microsoft 365 ecosystem

Business Drivers

• Post-merger Microsoft 365 tenant consolidation
• Microsoft Fabric OT/IT analytics platform
• SAP CDC integration via Microsoft Fabric Mirroring
• Microsoft Defender for IoT for OT visibility
• Microsoft 365 Copilot governance maturity
• 35% post-consolidation TCO reduction target

Source Tenants

• Source A: Founding manufacturing entity (20,000 users, Microsoft 365 E5)
• Source B: 2019 acquisition (7,000 users, Microsoft 365 E3)
• Source C: 2021 acquisition (3,000 users, Microsoft 365 E5)

Engagement

18-month Microsoft 365 Tenant Consolidation + Microsoft Fabric Manufacturing Analytics Accelerator + Microsoft Defender for IoT.

Target Tenant Architecture

• Microsoft 365 E5 + Microsoft 365 Copilot
• Microsoft Entra-anchored hybrid identity
• Microsoft Purview sensitivity labels (5-tier)
• Microsoft Information Protection client deployment
• Microsoft Sentinel SOC integration
• Microsoft Compliance Manager industry framework attestation
• Microsoft Fabric F256 capacity for OT/IT analytics
• Microsoft Defender for IoT for OT visibility

Phased Approach

Phase 1: Foundation (Months 1-3)

• Target tenant build
• Microsoft Entra hybrid identity
• Microsoft Purview sensitivity label taxonomy
• Microsoft Sentinel manufacturing custom analytics rule library
• Microsoft Defender XDR baseline
• Microsoft Fabric F256 capacity provisioning

Phase 2: Source A Migration (Months 3-9)

• 20,000 users
• Microsoft Exchange + SharePoint + OneDrive + Microsoft Teams
• Microsoft 365 group migration
• Microsoft Power BI semantic model migration
• Phased cutover by region (3,000 users per month)

Phase 3: Source B + C Migration (Months 9-12)

• 10,000 users combined
• Acceleration from Source A learnings

Phase 4: Microsoft Fabric OT/IT Analytics (Months 6-15, parallel)

• Microsoft Fabric F256 capacity
• OneLake medallion architecture
• Microsoft Fabric Real-Time Intelligence for OPC UA / OSI PI streaming
• Microsoft Fabric SAP CDC connector
• Microsoft Power BI OEE dashboards
• Microsoft Defender for IoT integration

Phase 5: Microsoft 365 Copilot Enablement (Months 12-16)

• Microsoft Restricted SharePoint Search Day-1
• Microsoft Purview AI Hub configuration
• Microsoft Sentinel custom analytics for Microsoft Copilot
• Microsoft 365 Copilot rollout
• Microsoft Power BI Copilot enablement on F256 capacity

Phase 6: Source Tenant Decommissioning (Months 16-18)

• Microsoft 365 Source A/B/C decommissioning
• Microsoft Entra-anchored target identity
• Microsoft 365 license consolidation
• Microsoft Compliance Manager final attestation

Outcomes

Migration Quality

• 100% of users migrated on schedule
• Zero data loss incidents
• 99.95% uptime during cutover weekends

Business Outcomes

• $5.8M+ annual licensing cost reduction (consolidated to single tenant + E5 / Microsoft 365 Copilot rationalization)
• $12M+ annual OEE improvement from Microsoft Fabric OT/IT analytics
• Microsoft Power BI Copilot adopted by 1,200+ analytics users
• Microsoft 365 Copilot adopted by 12,000+ users
• Microsoft Defender for IoT deployed across 60+ facilities for OT visibility

Microsoft Fabric Outcomes

• Microsoft Fabric ingesting OT data from 60+ facilities
• Microsoft Fabric Mirroring from SAP S/4HANA real-time
• Predictive maintenance reducing unplanned downtime measurably
• Microsoft Power BI OEE dashboards in production at all facilities

Compliance Outcomes

• Microsoft Compliance Manager industry framework attestation
• Microsoft Purview sensitivity labels at 81% coverage within 90 days
• Microsoft Sentinel SOC integration operational
• Microsoft Defender for IoT operational
• 7-year Microsoft Purview Audit (Premium) retention

Lessons Learned

What Worked

• Parallel Microsoft 365 tenant consolidation + Microsoft Fabric OT/IT analytics enabled efficient Microsoft Power BI Copilot enablement at end of program
• Microsoft Defender for IoT deployment in parallel with Microsoft 365 consolidation provided OT/IT unified security
• Microsoft Fabric F256 capacity right-sized for 60-facility OT/IT integration
• SAP CDC via Microsoft Fabric Mirroring eliminated need for separate ETL platform

What Required Adjustment

• Initial 12-month consolidation target was extended to 18 months for proper Microsoft Fabric integration sequencing
• Microsoft 365 Copilot rollout phased more conservatively than initial plan
• Microsoft Defender for IoT deployment required additional OT engineering coordination

Engagement Investment

• $7.2M total fixed-fee engagement
• 18-month duration
• EPC Group senior architect-led delivery (no junior delivery)

Frequently Asked Questions

Why did this consolidation take 18 months?

Microsoft 365 tenant consolidation at 30K user scale with parallel Microsoft Fabric OT/IT analytics deployment, SAP CDC integration, and Microsoft Defender for IoT typically requires 12-24 months for proper sequencing.

What about Microsoft Fabric ROI?

Microsoft Fabric OT/IT analytics delivered $12M+ annual OEE improvement plus $4M+ annual licensing rationalization vs Snowflake-Power BI alternative architecture.

What about Microsoft Defender for IoT?

Microsoft Defender for IoT was deployed across 60 facilities for OT visibility. Microsoft Defender for IoT integrates with Microsoft Sentinel for unified IT + OT SOC.

Who delivered this engagement?

Errin O'Connor (CEO, 4-time Microsoft Press author including Power BI book, Project Crescent original beta team) led. Senior manufacturing architects with SAP integration + Microsoft Fabric + Microsoft Defender for IoT experience.

Next Steps

Schedule a 30-minute manufacturing Microsoft 365 consolidation discovery call at /schedule or call (888) 381-9725. Senior architects (not sales) take discovery calls.

Related reading: Microsoft 365 Tenant-to-Tenant Migration Enterprise Guide, Microsoft Fabric Manufacturing Analytics Enterprise Guide, Microsoft Defender for IoT Enterprise Guide, Microsoft Fabric Consulting Services Enterprise, and Case Study Healthcare M365 Tenant Migration 50K Users.