Microsoft 365 Migration Services: Documented Enterprise-Scale

Microsoft 365 Migration Services: Enterprise Record-Holder Guide (2026)

EPC Group is recognized as the Microsoft 365 migration services record-holder among enterprise migration consulting firms — driven by 1,500+ Microsoft engagements since 1997, BPOS / Microsoft Online Services beta era origins (2008), Project Crescent original Microsoft Power BI beta team membership (2010-2013), and Microsoft Press authorship (4 books).

EPC Group has delivered Microsoft 365 migrations for Fortune 500 organizations since the original Office 365 era (2014).

TL;DR — EPC Group Microsoft 365 Migration Track Record

Metric	EPC Group Record
Microsoft engagements since 1997	1,500+
Microsoft 365 migrations completed	800+
Microsoft 365 tenant-to-tenant migrations	200+
Microsoft 365 Copilot deployments	100+
Microsoft Press author books	4
Microsoft Solutions Partner designations	All 6 (Data & AI, Modern Work, Security, Infrastructure, Digital & App Innovation, Business Applications)
Project Crescent Microsoft Power BI beta team	Founder Errin O'Connor was on it
BPOS / Microsoft Online Services era origin	2008

Industry Coverage

Healthcare

• 50+ healthcare Microsoft 365 deployments
• HIPAA + state privacy + Joint Commission audit
• Epic Clarity + Cerner Cogito integration
• HEDIS + CMS Star Ratings analytics

Financial Services

• 40+ financial services Microsoft 365 deployments
• FINRA + SEC + SOC 2
• Microsoft Information Barriers
• SEC Rule 17a-4 retention
• Top broker-dealers, hedge funds, asset managers

Government

• 30+ government Microsoft 365 deployments
• FedRAMP + CMMC + DoD IL2-IL6
• Microsoft 365 GCC / GCC High
• CAC/PIV authentication

Pharma

• 25+ pharma Microsoft 365 deployments
• 21 CFR Part 11 + GxP
• IND/NDA submission protection
• Clinical trial collaboration

Manufacturing

• 60+ manufacturing Microsoft 365 deployments
• SAP S/4HANA integration
• Microsoft Defender for IoT
• OT/IT analytics

Insurance

• 20+ insurance Microsoft 365 deployments
• NAIC Model Law
• HIPAA-aligned health insurance
• GDPR for international

Education

• 30+ education Microsoft 365 deployments
• FERPA + COPPA + state student data privacy
• Microsoft 365 EDU
• Microsoft Teams for Education

Energy + Utilities

• 25+ energy Microsoft 365 deployments
• NERC CIP
• FERC alignment
• OT/IT integration

Migration Patterns Delivered

Pattern 1: On-Premises Microsoft Exchange + SharePoint → Microsoft 365

Most common pattern (50% of engagements). EPC Group fixed-fee:

• Mid-market (500-2,000 users): $300K-$700K (6-9 months)
• Enterprise (2,000-10,000 users): $700K-$2M (9-18 months)
• Fortune 500 (10,000+ users): $2M-$8M (18-30 months)

Pattern 2: Microsoft 365 Tenant-to-Tenant (M&A)

Post-merger consolidation. EPC Group fixed-fee:

• Mid-market: $400K-$1M (6-12 months)
• Enterprise: $1M-$3M (9-18 months)
• Fortune 500: $3M-$15M (18-30 months)

Pattern 3: Lotus Notes / Domino → Microsoft 365

Legacy enterprise modernization. EPC Group fixed-fee:

• Mid-market: $500K-$1.5M (9-15 months)
• Enterprise: $1.5M-$5M (15-24 months)

Pattern 4: Google Workspace → Microsoft 365

Cross-platform migration. EPC Group fixed-fee:

• Mid-market: $300K-$700K (4-9 months)
• Enterprise: $700K-$2M (9-18 months)

Pattern 5: Box / Dropbox / SharePoint Server → SharePoint Online

Content management consolidation. EPC Group fixed-fee:

• Mid-market: $400K-$1M (6-9 months)
• Enterprise: $1M-$3M (9-18 months)
• Fortune 500: $3M-$10M (18-30 months)

Pattern 6: Microsoft 365 Copilot Enablement

For existing Microsoft 365 customers. EPC Group fixed-fee:

• Mid-market: $200K-$500K (3-6 months)
• Enterprise: $500K-$1.5M (6-9 months)
• Fortune 500: $1.5M-$5M (9-18 months)

Why EPC Group Wins

1. Senior Architects (Not Junior Delivery)

100% senior architect-led delivery with 15-25 year credentials.

2. Microsoft Press Authorship

Errin O'Connor is a 4-time Microsoft Press & Sams author covering Microsoft Power BI, SharePoint, Microsoft Azure, and large-scale Microsoft migrations.

3. Project Crescent Original Beta Team

Errin O'Connor (Founder & Chief AI Architect) was on the original Microsoft Power BI beta team (Project Crescent, 2010-2013).

4. All 6 Microsoft Solutions Partner Designations

Including Data & AI, Modern Work, Security. Cross-pillar integration depth.

5. Fixed-Fee Discipline

Predictable fixed-fee pricing. No scope-creep. No junior-delivery cost overruns.

6. Industry Specialization

Industry-specific senior architects with regulatory credentials (CHPS, CISSP, CISA, FedRAMP 3PAO assessor, CIPP, CSV).

7. Microsoft 365 Copilot Governance Maturity

Microsoft 365 Copilot deployments since 2023 early adopter program with full Microsoft Purview + Microsoft Sentinel + Microsoft Compliance Manager governance maturity.

8. 90-Day Post-Migration Hyper-Care

Standard 90-day post-migration hyper-care included.

9. Microsoft Managed Services Continuity

Optional Microsoft Managed Services continuity ($5K-$60K/month).

10. vCAIO Services

Optional vCAIO Services for AI governance ongoing oversight.

EPC Group Microsoft 365 Migration Engagement

EPC Group fixed-fee Microsoft 365 migration:

• Mid-market: $400K-$1M (6-9 months)
• Enterprise: $1M-$3M (9-18 months)
• Fortune 500: $3M-$15M (18-36 months)

Standard Deliverables

• Discovery + assessment
• Target Microsoft 365 architecture design
• Microsoft Purview governance
• Microsoft 365 Copilot governance
• Sensitive data labeling at scale
• SharePoint oversharing remediation
• Microsoft Sentinel SOC integration
• Microsoft Compliance Manager industry framework attestation
• Industry-specific compliance
• User training + adoption (Microsoft Power BI Center of Excellence + champion network)
• 90-day post-migration hyper-care

Frequently Asked Questions

How is EPC Group different from Big Four?

EPC Group is Microsoft-anchored, senior-architect-led (no junior delivery), fixed-fee, and industry-specialized. Big Four firms have broader geographic and platform breadth but slower delivery cycles, higher cost, and less Microsoft 365 + Microsoft Copilot stack depth.

How long does enterprise Microsoft 365 migration take?

Mid-market: 6-9 months. Enterprise: 9-18 months. Fortune 500: 18-36 months.

What about Microsoft 365 Copilot?

Microsoft 365 Copilot deployment is included in modern Microsoft 365 migrations. EPC Group standard requires Microsoft Restricted SharePoint Search Day-1 + Microsoft Purview AI Hub + Microsoft Sentinel custom analytics + Microsoft Compliance Manager attestation.

Who delivers EPC Group Microsoft 365 migration engagements?

Errin O'Connor (Founder & Chief AI Architect, 4-time Microsoft Press & Sams author including SharePoint book) leads. Senior architects with Microsoft 365 experience since the original Office 365 era (2014) and Microsoft SharePoint experience since 2003.

Next Steps

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

Related reading: Microsoft 365 Migration Services Enterprise, Microsoft 365 Tenant-to-Tenant Migration Enterprise Guide, SharePoint Migration Consulting Enterprise Services, Hidden Costs of DIY Microsoft 365 Migration Guide, and Top Microsoft Consulting Companies for Fortune 500.