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
Core 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 the senior architects. Errin O'Connor, EPC Group Founder & Chief AI Architect, is a 4-time Microsoft Press & Sams 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 core 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)

Commercial Model

EPC Group SharePoint migrations are fixed-scope and priced after a scoping call — assessment, planning, content cleanup, modern site provisioning, migration tooling, wave execution, governance setup and ninety days of post-migration support are inside the scope, and change requests are the only route to scope additions. Time-and-materials creates the wrong incentive on a migration; the firm should not earn more when the work takes longer.

Migration Wave Strategy

EPC Group's standard migration wave structure groups SharePoint sites by business priority, content sensitivity, and customization complexity. Wave 1 (months 1-2) is foundation: tenant-side topology, Microsoft Entra ID hybrid identity, target SharePoint Online architecture, Microsoft Purview taxonomy, and migration-tooling validation against a small representative site set. Wave 2 (months 3-6) targets non-regulated, low-customization sites for early ROI capture and team learning. Wave 3 (months 6-12) tackles regulated-industry sites with Restricted-tier sensitivity-label rollout and Microsoft Information Barriers integration. Wave 4 (months 12-18) handles the most-complex sites including custom InfoPath replacement with Microsoft Power Apps, SharePoint Designer workflow replacement with Microsoft Power Automate, and SharePoint Framework solution remediation. Wave 5 is steady-state: residual content, decommissioning legacy SharePoint Server, and Microsoft 365 Copilot enablement under managed services.

The wave structure matters because it controls risk concentration. Putting all complex sites in a single wave creates timeline risk. Spreading complex sites across waves with simpler sites creates a more sustainable delivery pace.

Industry-Specific Migration Patterns

Healthcare (HIPAA)

Restricted-PHI sensitivity-tier rollout to PHI-tagged sites. Microsoft Customer Lockbox enabled. HIPAA Business Associate Agreement coverage validated. Microsoft Purview Audit (Premium) configured for seven-year retention. OCR audit-readiness packages produced.

Financial Services (FINRA, SEC)

Microsoft Information Barriers operations across investment-banking, equity research, sales/trading, and asset-management segments. Restricted-MNPI sensitivity-tier rollout. SEC Rule 17a-4 retention via Microsoft Purview Records Management. FINRA Rule 3110 supervisory analytics. Annual SOC 2 Type II support.

Government (FedRAMP, CMMC)

Microsoft 365 GCC or GCC High deployment per customer scope. Restricted-CUI sensitivity-tier rollout. CAC/PIV authentication. CMMC Level 2 or Level 3 documentation. ITAR-aware patterns where required.

Pharma (GxP)

Restricted-Clinical and Restricted-IND-NDA sensitivity-tier rollout. 21 CFR Part 11 audit-trail integrity. Computer System Validation documentation. IND/NDA submission protection.

Operating Cadence Under Managed Services

Post-migration steady-state operations are scoped under EPC Group's managed-services tier model. Daily activities cover Microsoft Sentinel alert triage on SharePoint events and Microsoft Purview audit-log review. Weekly activities cover false-positive tuning, sensitivity-label gap remediation, and Microsoft Purview AI Hub alert disposition. Monthly activities cover Microsoft Compliance Manager score review and permission-cleanup progress. Quarterly activities cover the formal Microsoft Compliance Manager attestation cycle, regulator-readiness review, and board-level security reporting.

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.

The Five-Phase Delivery Method in Practice

Every EPC Group migration runs through five phases with defined deliverables and a sign-off gate before the next one starts.

1. Discovery and assessment (two to three weeks) — source environment audit (sites, lists, libraries, permissions), data-volume and complexity analysis, custom workflow and InfoPath inventory, third-party application dependency mapping, compliance requirements, migration-tool selection and licensing.
2. Architecture and planning (two to four weeks) — the target SharePoint Online information architecture, site-collection and hub-site structure, the permission model redesigned on Microsoft Entra ID groups, the governance framework, wave planning and scheduling, the communication and change-management plan.
3. Pilot migration (one to two weeks) — two or three representative sites migrated, permissions validated and user-acceptance tested, performance benchmarked against the timeline, issues remediated, the migration runbook finalized, stakeholder sign-off on the approach.
4. Full migration execution (four to sixteen weeks) — parallel migration streams, incremental sync for active content, SharePoint Designer workflows converted to Power Automate and InfoPath forms to Power Apps, daily progress reporting and issue triage, cut-over scheduling.
5. Validation and optimization (two to three weeks) — content integrity verified (file counts, checksums), permissions audited, search configured and verified, performance tuned, users trained, and the source environment scheduled for decommissioning.

Permission remediation happens before the migration, not during or after it. Migrating hundreds of unique permission sets creates an ungovernable estate in SharePoint Online, and Copilot will surface whatever the permissions allow.

Migration Tooling Selection

Source	Recommended tool
SharePoint Server 2013–2019	SharePoint Migration Tool (SPMT)
SharePoint Online (tenant-to-tenant)	Microsoft 365 Migration Manager or Quest On Demand Migration
Lotus Notes / Domino	Quest On Demand Migration
File shares (Windows / NetApp / EMC)	SPMT or AvePoint
Third-party intranets (Workplace, Igloo, Simpplr)	ShareGate or AvePoint
Custom sources	Custom migration tooling

ShareGate is the workhorse for SharePoint Server sources and permission preservation in hub-and-spoke architectures; AvePoint carries enterprise scale with the compliance reporting regulated industries need; the Microsoft-native tools fit in-place tenant scenarios. Most enterprise migrations use a combination chosen by source platform, data volume and compliance scope.

Tenant Selection for Regulated Migrations

Industry	Recommended Microsoft 365 tenant
Healthcare (HIPAA)	Commercial or GCC
Financial services (FINRA / SEC)	Commercial
Federal civilian	GCC (FedRAMP Moderate)
DoD IL2 / IL4	GCC
DoD IL5 and ITAR	GCC High
DoD IL6	Microsoft 365 DoD (separate tenant)
State and local with federal data	GCC
Pharma (GxP)	Commercial with enhanced governance

A tenant-to-tenant move from commercial Microsoft 365 to GCC High for CMMC scope runs twelve to twenty-four weeks: identity migration, data migration, permission remapping and CMMC Level 2 or 3 information-architecture controls.

What a Regulated Migration Adds

Pre-migration compliance setup. The Microsoft Online Services Business Associate Agreement executed and verified for HIPAA; a Compliance Manager assessment baseline; the Purview sensitivity-label taxonomy published; Purview Audit (Premium) configured for seven-year retention; Sentinel SOC integration prepared; the industry control mappings (HIPAA, FINRA, FedRAMP, CMMC, GxP) in hand before content moves.

The sensitivity-label coverage push. Auto-labeling rules for the industry's patterns — PHI (medical record numbers, name plus date of birth, ICD-10 codes, prescriptions), financial (SSNs, card numbers, MNPI keywords, pre-public SEC content), government (CUI markers, ITAR keywords, classification banners), pharma (clinical-trial patient identifiers, IND/NDA submission content) — so coverage on regulated content is high before any tenant-wide Copilot activation, rather than dependent on users labeling by hand.

Information Barriers where the industry requires them. Research versus investment banking in financial services, program teams by classification level in defense, clinical operations versus commercial in pharma, matter teams in legal.

Audit-ready documentation. An Architecture Decision Record with traceable decisions, a customer-responsibility matrix mapped to Microsoft's attestation, Compliance Manager evidence, a plan of action and milestones for any control gap, a Sentinel custom analytics rule library, and an annual third-party assessment readiness package.

Copilot oversharing remediation. Restricted SharePoint Search on day one, permission cleanup over the following months, Purview AI Hub monitoring — so Copilot grounds only on curated sites until the cleanup completes.

Five Migration Mistakes That Cost the Most

1. Migrating broken permissions. Audit and remediate before the migration; migrating hundreds of unique permission sets creates an ungovernable mess in SharePoint Online.
2. Ignoring workflow dependencies. SharePoint 2010/2013 workflows and InfoPath forms do not migrate to SharePoint Online. Map every workflow and decide: convert to Power Automate, redesign, or retire; InfoPath forms become Power Apps.
3. No pilot migration. Migrate two or three representative sites first and validate permissions, search, metadata and the user experience before committing to full waves.
4. Big-bang cut-over. Phased migration with incremental sync lets users work in both environments during the transition; there is no single weekend on which everything must work.
5. Skipping user training. Modern SharePoint looks and works differently from classic. Without training, users go back to emailing files instead of sharing links and saving locally instead of to OneDrive.

Modern Hub-and-Spoke Information Architecture

The hub-and-spoke architecture is the 2026 standard for enterprise SharePoint: one root hub per business unit (IT, HR, Finance, Operations), five to fifteen spoke sites per hub, mega-menu navigation tied to the Viva Connections home site, and sensitivity-label-driven sharing controls at the site level. It shortens content discovery, cuts the "where do I save this?" help-desk traffic, and gives Copilot a governed surface to ground on.

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 & Sams author including a SharePoint book. Senior architects bring MS-301, Microsoft Information Protection Specialist, and CIPP credentials.

How are permissions handled during a SharePoint migration?

Permission migration is the most complex part of an enterprise move. The method: a pre-migration permission audit and cleanup, Entra ID group mapping, permission consolidation so unique permissions shrink substantially, automated verification after each wave, site-collection administrator assignment, and external-sharing policy configuration. Broken or over-permissioned structures are fixed first, never migrated as-is.

Can SharePoint workflows be migrated to Power Automate?

SharePoint 2010/2013 and SharePoint Designer workflows must be converted for SharePoint Online. Simple approval workflows convert directly; complex multi-step workflows with custom code are redesigned; InfoPath forms become Power Apps. A workflow assessment report classifies each one as convert, redesign or retire before the migration starts.

Should we migrate to SharePoint Online or stay on SharePoint Server Subscription Edition?

SharePoint Online (inside Microsoft 365) is the recommended target for most organizations: no infrastructure to run, automatic updates, Copilot and Microsoft 365 integration, modern authentication. SharePoint Server Subscription Edition remains the path for strict data-sovereignty or air-gapped requirements. Organizations that need stronger isolation in the cloud use Azure Private Link with SharePoint Online.

What compliance considerations apply to a SharePoint migration?

HIPAA: encrypted transfer for PHI, BAA coverage verified for the migration tools, audit logs of every data movement. SOC 2: documented migration controls, chain of custody, post-migration access-control validation. FedRAMP and CMMC: a GCC or GCC High tenant for government data and FedRAMP-aligned tooling. GDPR: data residency during the migration, right-to-erasure handling, data-processing agreements. Compliance validation is a standard phase in every regulated migration.

Microsoft 365 GCC or GCC High — which one?

Federal civilian unclassified workloads: GCC (FedRAMP Moderate). DoD IL2 and IL4: GCC. DoD IL5 and ITAR: GCC High. DoD IL6: a separate Microsoft 365 DoD tenant. EPC Group has delivered migrations across all four tenant types.

Can we use Microsoft 365 Copilot in a HIPAA environment after the migration?

Yes. Microsoft 365 Copilot is HIPAA-eligible under the BAA. Restricted SharePoint Search controls where Copilot grounds, the Purview AI Hub monitors it, and a Restricted-PHI sensitivity tier keeps Copilot away from PHI documents. Sequencing those controls before the licenses are assigned is the point.

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, CMMC Microsoft 365 Deployment Guide for Defense Contractors (2026), and SharePoint Premium Document Intelligence Enterprise Guide.