Best SharePoint Migration Services 2026

Best SharePoint Migration Services: Enterprise Buyer's Guide (2026)

SharePoint migration projects fail more often than they succeed when delivered by general IT consultants without senior SharePoint expertise. This is the working enterprise SharePoint migration buyer's guide EPC Group uses for Fortune 500 organizations evaluating migration partners — what to look for, what to avoid, and how to vet senior architects.

EPC Group has delivered SharePoint migrations since 2003, including end-of-support migrations from SharePoint 2007/2010/2013/2016/2019, Lotus Notes/Domino-to-SharePoint, file-share-to-SharePoint, and tenant-to-tenant Microsoft 365 migrations.

TL;DR — What Makes Best-in-Class SharePoint Migration Services

Criterion	Why It Matters
Senior SharePoint architect lead (10+ years)	Long arc of architectural context
All 6 Microsoft Solutions Partner designations	Cross-pillar integration depth
Fixed-fee engagement model	Predictable cost, scope discipline
Microsoft Press authorship	Demonstrated technical leadership
Regulated-industry experience	HIPAA / FINRA / FedRAMP depth
Audit-ready documentation	Regulator-defensible by default
Microsoft 365 Copilot integration	Modern stack ready
Microsoft Purview governance	Compliance plane built-in

Migration Scenarios EPC Group Handles

Scenario 1: SharePoint 2016 / 2019 to SharePoint Online

End-of-support driven migrations — SharePoint 2016 (mainstream support ended) and SharePoint 2019 (mainstream support ended Oct 2025) require migration. Microsoft Exchange Subscription Edition (SE) requires active Microsoft Cloud commitment.

EPC Group's migration scope:

• Microsoft 365 Tenant assessment
• Microsoft Entra ID hybrid identity
• SharePoint Online site provisioning
• Modern site templates (hub-and-spoke)
• Content migration (file-by-file or bulk)
• Custom solution remediation (SPFx for SharePoint Framework, Power Apps for InfoPath)
• Microsoft Power Automate for SharePoint Designer workflow replacement
• Microsoft Purview governance setup
• Microsoft 365 Copilot enablement
• 90-day post-migration support

Scenario 2: Lotus Notes / Domino to SharePoint Online

Lotus Domino end-of-support migrations require:

• Lotus database (NSF) inventory
• Application analysis (Notes apps → Power Apps decisions)
• Content migration tooling (Quest, BitTitan, AvePoint)
• Custom application redesign on Microsoft Power Platform
• Lotus Connections / Sametime → Microsoft Viva / Microsoft Teams transition

Scenario 3: File-Share to SharePoint Online

On-premises Windows file shares to SharePoint Online:

• Permissions audit and cleanup
• Folder structure modernization (flat hubs vs deep folders)
• Microsoft Purview sensitivity label backfill
• Microsoft 365 Group provisioning
• Microsoft OneDrive for Business consolidation
• Microsoft Teams integration

Scenario 4: Microsoft 365 Tenant-to-Tenant

M&A integration, divestiture, regulatory restructuring (commercial → GCC):

• Identity coexistence (Microsoft Entra Cross-Tenant Access)
• Mail flow coexistence
• SharePoint, OneDrive, Microsoft Teams migration
• Microsoft Power Platform migration
• Microsoft Dynamics 365 migration
• Microsoft Purview governance continuity

What to Look For in a SharePoint Migration Partner

Senior Architect Depth

Critical question: Who is the named senior SharePoint architect on the engagement?

Red flags:

• Engagement primarily staffed with junior consultants
• Senior architect is "available for escalation" but not actively engaged
• No SharePoint-specific architect (general IT consultant claiming SharePoint expertise)
• Senior architect joined firm <2 years ago

EPC Group standard: 10+ year senior SharePoint architect leads engagement, originated from SharePoint Server 2003-2010 era for senior senior architects. Errin O'Connor, EPC Group CEO, is a 4-time Microsoft Press author including a SharePoint book.

Microsoft Solutions Partner Status

Verify the firm holds:

• Microsoft Solutions Partner Modern Work designation (covers SharePoint)
• Microsoft Solutions Partner Security designation (covers Microsoft Purview, Microsoft Defender)
• Microsoft Solutions Partner Data & AI designation (covers Microsoft Copilot, Microsoft Fabric)

EPC Group holds all 6 Microsoft Solutions Partner designations.

Industry-Specific Experience

For regulated industries, the partner must have demonstrated experience:

• Healthcare — HIPAA migrations, BAA execution, PHI sensitivity labeling
• Financial Services — FINRA Rule 3110 supervision, SEC Rule 17a-4 retention, Information Barriers
• Government — Microsoft 365 GCC / GCC High migrations, FedRAMP compliance, CUI handling

Fixed-Fee vs Time-and-Materials

Fixed-fee engagements align consultant and customer interests on rapid, high-quality delivery. Time-and-materials creates misaligned incentives — consultancy makes more money when work takes longer.

EPC Group standard: fixed-fee for all migration engagements with documented Statement of Work and change request process for scope additions.

Microsoft Copilot Integration

Modern SharePoint migrations include Microsoft Copilot enablement. Best-in-class partners scope:

• Microsoft 365 Copilot governance setup
• SharePoint Restricted Search (Day 1)
• Microsoft Purview AI Hub configuration
• Microsoft Copilot Studio agent design (post-migration)

Pricing Reference

EPC Group fixed-fee SharePoint migration:

Engagement Size	Investment	Duration
Mid-market (50-200 sites)	$250K-$500K	6-9 months
Enterprise (200-1,000 sites)	$500K-$1.5M	9-18 months
Fortune 500 (1,000+ sites)	$1.5M-$5M	18-30 months
Multi-tenant / global / regulated	$5M-$25M	24-48 months

Includes assessment, planning, content cleanup, modern site provisioning, migration tooling, wave execution, governance setup, and 90-day post-migration support.

Common SharePoint Migration Pitfalls

Pitfall 1: Skipping Content Cleanup

Migrating 100% of legacy content to SharePoint Online preserves duplicate, obsolete, and trivial (DOT) content that creates Microsoft 365 Copilot grounding noise and storage costs. EPC Group standard: 60-70% volume reduction during migration through Microsoft Purview Data Lifecycle Management.

Pitfall 2: Ignoring Permissions Debt

5-15 years of accumulated SharePoint permissions create oversharing risk that Microsoft 365 Copilot will surface. Permission cleanup (replace "Everyone except external users" with named groups) must be in scope.

Pitfall 3: Migrating InfoPath / SharePoint Designer As-Is

InfoPath is deprecated. SharePoint Designer 2013 workflows are deprecated. Best-in-class migration includes Power Apps replacement of InfoPath forms and Power Automate replacement of SharePoint Designer workflows.

Pitfall 4: Microsoft Copilot Day 1 Without Governance

Activating Microsoft 365 Copilot tenant-wide on Day 1 without sensitivity labeling, oversharing remediation, or Microsoft Purview AI Hub monitoring causes compliance findings. Governance-first sequencing is mandatory.

Pitfall 5: Junior-Consultant-Heavy Staffing

Engagements staffed primarily with junior consultants without senior architect engagement deliver missed deadlines and architecture quality issues. Insist on named senior architect leadership.

Frequently Asked Questions

Why is SharePoint migration cost so wide-ranging?

Migration cost depends on: site count, content volume, customization complexity, user count, regulated-industry compliance scope, custom solution remediation (SPFx, Power Apps, Power Automate), and post-migration governance setup. Fixed-fee discipline requires accurate scoping.

How long does enterprise SharePoint migration take?

Mid-market: 6-9 months. Enterprise: 9-18 months. Fortune 500: 18-30 months. Faster is technically possible but creates content quality, governance, and Microsoft Copilot grounding risk.

What's the most common mistake?

Skipping content cleanup. Migrating 100% of legacy content perpetuates 5-15 years of accumulated permissions debt, duplicate content, and abandoned sites. Microsoft 365 Copilot grounding quality scales inversely with junk content volume.

Should we use SPMT, ShareGate, AvePoint, or Quest?

Microsoft 365 Migration Manager (SPMT) for cloud-to-cloud. ShareGate for SharePoint Server source migrations. AvePoint Cloud Migration for enterprise-scale regulated. Quest On Demand Migration for tenant-to-tenant. EPC Group typically uses combinations based on scenario.

What about Microsoft 365 Copilot in migrated environments?

Modern SharePoint architecture is the foundation for Microsoft 365 Copilot quality. Sensitivity-label coverage, Microsoft Restricted Search, and oversharing remediation must be in scope. See Copilot for Microsoft 365 Complete Deployment Guide.

Who delivers EPC Group SharePoint migrations?

EPC Group senior architects with combined SharePoint experience since 2003. Errin O'Connor is a 4-time Microsoft Press author including a SharePoint book. Senior architects bring MS-301, Microsoft Information Protection Specialist, and CIPP credentials.

Next Steps

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

Related reading: SharePoint Modernization: Classic to Modern Migration Guide, SharePoint Online Migration Guide, SharePoint Permissions Best Practices, Microsoft 365 Tenant-to-Tenant Migration Enterprise Guide, and Copilot for Microsoft 365 Complete Deployment Guide.