
The 2026 Migration Decision Guide: TCO analysis, security comparison, and a data-driven framework for the most important SharePoint decision your organization will make.
Should you migrate from SharePoint on-premises to SharePoint Online? For the vast majority of organizations in 2026, yes. SharePoint Server 2019 extended support ends July 14, 2026, eliminating security patches and compliance coverage. SharePoint Online delivers AI-powered features (Copilot, SharePoint Premium), zero-trust security through Microsoft Purview and Entra ID, and 30-50% lower total cost of ownership when the full Microsoft 365 suite is factored in. The only organizations that should remain on-premises are those with non-negotiable data sovereignty mandates that prohibit any cloud storage, or those operating in air-gapped classified environments. Everyone else should be planning their migration now.
SharePoint on-premises has served enterprises well for two decades. But 2026 marks a definitive inflection point: Microsoft is investing almost exclusively in SharePoint Online, the AI capability gap between cloud and on-premises is now insurmountable, and the cost of maintaining aging server infrastructure is climbing while cloud economics improve. Organizations that delay this decision are not preserving stability — they are accumulating technical debt and competitive disadvantage.
This guide is built from EPC Group's experience migrating over 500 SharePoint environments to Microsoft 365 across healthcare, financial services, government, and Fortune 500 enterprises. We present the honest comparison — including the scenarios where on-premises still makes sense — so your organization can make a confident, data-driven decision.
If you are evaluating SharePoint consulting partners for this migration, or want to understand how leading migration firms approach enterprise SharePoint moves, those resources complement this decision guide.
Microsoft has been signaling the sunset of on-premises SharePoint for years. The timeline below makes the trajectory clear — and the urgency unmistakable for organizations still running SharePoint Server 2016 or 2019.
July 2021
Microsoft's bridge product for organizations not yet ready for cloud. Receives feature parity updates from Online — but always 12-18 months behind.
April 2023
No more security patches for SP 2016. Organizations still running it are exposed to unpatched vulnerabilities.
January 2024
No more feature updates or non-security bug fixes. Only critical security patches continue through extended support.
July 2026
Final end of all Microsoft support. No security patches, no bug fixes, no technical assistance. Running SP 2019 after this date is an active security and compliance risk.
Ongoing
SE remains supported but will always trail SharePoint Online by 12-18 months. AI features (Copilot, Premium) are not planned for SE. The feature gap widens every quarter.
2026+
SharePoint Premium, Copilot integration, AI agents, Loop integration, and Mesh experiences are Online-exclusive. The on-premises product is in maintenance mode in all but name.
EPC Group Advisory: If your organization is still running SharePoint Server 2019, you have less than 3 months of security coverage remaining as of April 2026. Begin migration planning immediately — even an accelerated lift-and-shift to SharePoint Online is preferable to running an unpatched on-premises farm. For organizations on SharePoint Server SE, the urgency is lower, but the strategic direction is the same: plan your migration to capture AI capabilities and reduce infrastructure burden.
SharePoint Online leads in 9 of 12 categories. On-premises retains advantages only in deep customization, data sovereignty, and network control.
| Feature | SharePoint Online | SharePoint On-Premises |
|---|---|---|
| AI / Copilot IntegrationOnline | Microsoft 365 Copilot, SharePoint Premium AI, Copilot Agents | None — no AI capabilities available |
| Document IntelligenceOnline | SharePoint Premium: auto-classification, extraction, content assembly | Manual metadata tagging only |
| SearchOnline | Microsoft Search with AI-powered semantic search, Copilot answers | SharePoint Search (keyword-based, no AI augmentation) |
| CollaborationOnline | Real-time co-authoring, Teams integration, Loop components | Basic co-authoring (Office Web Apps required separately) |
| Mobile ExperienceOnline | Native SharePoint mobile app with offline access | Browser-only (responsive design varies by master page) |
| Storage | 1 TB per org + 10 GB per licensed user (pooled) | Limited by SQL Server storage and hardware budget |
| Customization DepthOn-Prem | SPFx web parts, Power Platform, Graph API, Copilot extensibility | Farm solutions, sandbox solutions, full server-side code access |
| Update CadenceOnline | Continuous updates — new features monthly, no downtime | Cumulative updates quarterly, requires planned downtime |
| Compliance ToolsOnline | Purview DLP, sensitivity labels, retention, eDiscovery, audit logs | Basic audit logs, IRM (requires AD RMS), limited DLP |
| Backup & DROnline | Microsoft manages geo-redundant backup, 93-day recycle bin | Self-managed: SQL backups, farm DR, secondary datacenter |
| Data SovereigntyOn-Prem | Multi-Geo available ($), data residency options expanding | Full control — data never leaves your datacenter |
| Network ControlOn-Prem | Internet-dependent, Private Link available for hybrid | Full LAN/WAN control, air-gapped possible |
SharePoint Online wins 9 categories, on-premises wins 3, and storage is a tie. The feature gap is widening every quarter as Microsoft invests exclusively in the cloud platform.
A fair cost comparison must account for the full Microsoft 365 bundle included with SharePoint Online. When you factor in Exchange, Teams, OneDrive, and security tools, the cloud economics are compelling.
| Cost Category | SharePoint Online (M365 E3) | SharePoint On-Premises | Notes |
|---|---|---|---|
| Server Hardware (3 servers) | $0 | $45,000-$75,000 | Web front-end, app, SQL Server |
| SQL Server Licensing | $0 (included) | $45,000-$90,000 | Enterprise edition for HA |
| Windows Server + CALs | $0 (included) | $15,000-$25,000 | Server licenses + 500 CALs |
| SharePoint Server License | $0 (included) | $8,000-$12,000 | Plus 500 SharePoint CALs |
| M365 / SharePoint Online License | $648,000 | $0 | $36/user/mo x 500 x 36 months (E3) |
| IT Staff (SharePoint Admin) | $36,000 | $270,000-$360,000 | Online: 0.2 FTE; On-prem: 1.5 FTE |
| Datacenter / Hosting | $0 | $54,000-$108,000 | Power, cooling, rack space, network |
| Backup & DR Infrastructure | $0 (included) | $40,000-$65,000 | Secondary site, backup software |
| Security Patching & Updates | $0 (Microsoft-managed) | $27,000-$45,000 | Staff time for CU testing and deployment |
| 3-Year Total | $684,000 | $504,000-$780,000 | Online includes full M365 suite |
| Per-User / Month | $38/user/mo | $28-$43/user/mo | On-prem is SharePoint only; Online is full M365 |
Key Insight: The on-premises 3-year cost of $504,000-$780,000 buys you only SharePoint. The SharePoint Online cost of $684,000 includes the entire Microsoft 365 E3 suite: Exchange Online, Teams, OneDrive for Business, Microsoft Defender, Purview compliance tools, and Power Platform basic licenses. When you subtract the value of these bundled services, the effective cost of SharePoint Online alone is approximately $8-$12 per user per month — roughly 60% less than on-premises. EPC Group builds detailed TCO models for every migration engagement to ensure the financial case is ironclad before you commit.
The most persistent objection to SharePoint Online migration is security. “Our data is safer in our own datacenter.” In 2026, this is almost always wrong. Microsoft invests over $4 billion annually in security across its cloud infrastructure — a budget that no single enterprise can match. The question is not whether the cloud can be secure. The question is whether your on-premises environment is actually more secure than what Microsoft provides.
For regulated industries — healthcare organizations bound by HIPAA, financial firms requiring SOC 2 attestation, government agencies needing FedRAMP authorization — SharePoint Online with Microsoft 365 GCC or GCC High provides purpose-built compliance environments that most on-premises deployments cannot match. The compliance tooling alone (Purview DLP, retention policies, eDiscovery, communication compliance) would cost hundreds of thousands of dollars to replicate on-premises with third-party tools.
The single most compelling reason to migrate to SharePoint Online in 2026 is AI. SharePoint Premium (formerly Syntex) and Microsoft 365 Copilot are transforming how organizations manage, find, and use content. None of these capabilities exist on-premises, and Microsoft has no plans to bring them to SharePoint Server.
AI models that automatically classify documents, extract key fields (dates, amounts, parties), and apply metadata — eliminating manual tagging across millions of documents.
Template-based document generation that pulls data from SharePoint lists, Dataverse, or other sources to create standardized contracts, proposals, and reports automatically.
Natural language search across your entire document library. Ask questions like "Find the latest vendor contract with renewal terms" and get AI-generated answers with source citations.
Build custom AI agents grounded in your SharePoint content. Create a compliance agent that answers policy questions, or an onboarding agent that guides new hires through documentation.
Native electronic signature workflows embedded directly in SharePoint document libraries — no third-party tools required for standard signature scenarios.
AI-powered metadata extraction that automatically populates SharePoint columns by reading document content — turning unstructured documents into structured, searchable data.
The AI Gap Is Permanent: Microsoft has explicitly stated that SharePoint Premium and Copilot features will not be ported to SharePoint Server. This is not a temporary feature delay — it is an architectural decision. AI features require cloud-scale compute, Microsoft Graph connectivity, and Azure AI services that cannot run in an on-premises datacenter. Every month you remain on-premises, the AI capability gap between your environment and cloud-first competitors widens.
SharePoint hybrid connects your on-premises farm to SharePoint Online, creating a unified experience for users while you plan and execute your full migration. It is an essential transitional tool — but EPC Group strongly advises against treating hybrid as a permanent architecture. Running both environments doubles your operational cost and complexity without delivering the full benefits of either platform.
The recommended hybrid approach is cloud-first hybrid: all new sites and content are created in SharePoint Online from day one. Existing on-premises content is migrated in planned waves. Hybrid infrastructure provides the bridge so users can access both environments seamlessly during the transition period. Once migration is complete, the on-premises farm is decommissioned.
EPC Group typically deploys hybrid as a 4-6 week pre-migration phase, followed by wave-based content migration over 12-24 weeks, concluding with on-premises decommissioning. Total hybrid-to-complete-cloud timeline for a 500-user organization: 16-30 weeks.
There is no one-size-fits-all migration. The right approach depends on your content volume, customization complexity, organizational readiness, and timeline constraints.
Move content as-is from on-premises to SharePoint Online using migration tools. Fastest approach but carries forward existing information architecture problems.
Best for: Organizations with clean, well-structured content and minimal customizations
Timeline: 4-8 weeks for 500 users
Migrate department by department or site collection by site collection. Allows learning from early phases and adjusting the approach. Most common for mid-to-large organizations.
Best for: Organizations with 1,000+ users, moderate customizations, or change management concerns
Timeline: 12-24 weeks for 2,000 users
Deploy SharePoint hybrid to connect both environments. Redirect OneDrive and new sites to Online while gradually migrating existing content. Users experience a unified interface throughout.
Best for: Organizations that cannot tolerate any productivity disruption during migration
Timeline: 16-32 weeks including hybrid setup
Design a new information architecture in SharePoint Online from scratch. Migrate only active, valuable content — archive or decommission the rest. Most transformative but most effort-intensive.
Best for: Organizations with significant technical debt, poor IA, or major governance gaps
Timeline: 24-48 weeks for complex environments
One of the most valuable outcomes of a SharePoint migration is the opportunity to clean house. Most on-premises environments contain 30-40% redundant, obsolete, or trivial (ROT) content that should not be migrated. Migrating everything wastes time, storage, and money — and carries forward the information architecture problems that plagued your on-premises environment.
Documents accessed or modified within the last 18 months, active project sites, HR policies, compliance documentation, operational procedures, customer-facing content, and any content with active retention requirements. This typically represents 40-50% of total content volume.
Completed project sites, historical financial records, past employee files, legacy documentation with regulatory retention requirements, and audit trail content. Archive to Azure Blob Storage (cool tier) or migrate to SharePoint Online with retention labels. Typically 20-30% of total content.
Duplicate files (often 15-20% of total content), personal files in team sites, outdated drafts, test sites, training content from years-old systems, and content with no owner and no access in 3+ years. Verify with content owners before deletion. Typically 25-40% of total content.
EPC Group runs a content assessment using SharePoint Migration Assessment Tool (SMAT) and custom PowerShell scripts to generate a complete inventory: content volume by site collection, last modified dates, file types, large files, checked-out files, orphaned content, and migration blockers. This assessment is the foundation of every migration plan we build.
Customization migration is where most SharePoint projects get complicated. SharePoint on-premises allowed deep server-side customizations — farm solutions, InfoPath forms, SharePoint Designer workflows, timer jobs, and custom web parts — that cannot run in SharePoint Online's multi-tenant environment. Each customization category has a defined replacement path.
| On-Premises Component | SharePoint Online Replacement | Migration Complexity |
|---|---|---|
| InfoPath Forms | Power Apps (canvas or model-driven) | Medium — requires rebuild but improved UX |
| SharePoint Designer Workflows | Power Automate (cloud flows) | Medium — logic translates, triggers differ |
| SharePoint 2010 Workflows | Power Automate | Medium-High — may require architecture changes |
| Farm Solutions (.wsp) | SharePoint Framework (SPFx) web parts + APIs | High — full rebuild required |
| Sandbox Solutions | SPFx web parts or Power Platform | Medium — scope is typically smaller |
| Timer Jobs | Azure Functions + Microsoft Graph API | Medium — cleaner architecture in cloud |
| Custom Web Parts (server-side) | SPFx client-side web parts (React/TypeScript) | Medium-High — different programming model |
| Custom Master Pages | Modern site themes + SPFx extensions | Low-Medium — modern theming is simpler |
| Event Receivers | SharePoint webhooks + Azure Functions | Medium — event-driven architecture |
| BCS (Business Connectivity Services) | Power Platform connectors + custom APIs | Medium — better integration options available |
The most common migration blocker is InfoPath forms. Many organizations have 50-200 InfoPath forms handling everything from purchase orders to employee onboarding. EPC Group performs a full InfoPath inventory, categorizes forms by complexity (simple, moderate, complex), and builds a prioritized Power Apps rebuild plan. Simple forms can be converted in 2-4 hours each. Complex forms with code-behind, database connections, and multi-step logic may require 2-4 weeks each.
For organizations with extensive custom code, EPC Group recommends a parallel development approach: begin rebuilding critical customizations in SPFx and Power Platform 8-12 weeks before content migration starts. This ensures the new solutions are tested and ready when users are moved to SharePoint Online.
Use this weighted scoring framework to evaluate SharePoint Online vs on-premises for your specific organization. Scores are based on EPC Group's assessment of the typical enterprise scenario. Adjust weights to match your priorities.
| Decision Factor | Weight | Online (1-10) | On-Prem (1-10) | Reasoning |
|---|---|---|---|---|
| Data Sovereignty Mandate | 15% | 6 | 10 | On-prem wins only if regulations require data in your physical datacenter with no cloud exceptions |
| AI & Copilot Readiness | 15% | 10 | 1 | SharePoint Premium, M365 Copilot, and AI agents are Online-exclusive features |
| Total Cost of Ownership | 15% | 8 | 5 | Online delivers more value per dollar when full M365 suite is factored in |
| Security & Compliance | 15% | 9 | 6 | Microsoft Purview, Conditional Access, and zero-trust exceed most on-prem deployments |
| Customization Requirements | 10% | 7 | 9 | On-prem allows farm solutions; Online requires SPFx/Power Platform (sufficient for 90% of cases) |
| IT Staff & Expertise | 10% | 9 | 4 | Online eliminates server management; on-prem requires dedicated SharePoint farm admins |
| Feature Currency | 10% | 10 | 3 | Online receives monthly updates; on-prem is years behind in features |
| Collaboration & Remote Work | 10% | 10 | 4 | Teams integration, real-time co-authoring, and mobile access are Online strengths |
| Weighted Score | 100% | 8.6 | 5.3 | SharePoint Online wins by 3.3 points for the typical enterprise |
Are you required to keep all data in a physical datacenter you control with zero cloud exposure?
Yes → Stay on SharePoint Server Subscription Edition (SE). You are in the 5% of organizations with genuine air-gap requirements.
No → Continue to next question.
Do you have heavy farm solutions or server-side customizations that would take 6+ months to rebuild?
Yes → Deploy hybrid now. Begin customization modernization in parallel. Plan full migration within 12-18 months.
No → Continue to next question.
Is your SharePoint content reasonably organized with minimal customizations?
Yes → Execute a phased migration to SharePoint Online. Target 8-16 week completion.
No → Execute a greenfield rebuild. Design new information architecture in Online, migrate only active content, archive the rest.
EPC Group has been migrating SharePoint environments since SharePoint 2003. Our team has executed over 500 migrations across every industry, every version of SharePoint, and every complexity level — from 50-user departments to 80,000-user global enterprises. We bring a methodology refined over 20+ years and a deep understanding of the technical, organizational, and compliance challenges that make SharePoint migrations succeed or fail.
500+
SharePoint migrations completed
100+ TB
Largest single migration
25+ Years
Microsoft ecosystem expertise
For most organizations in 2026, yes. Microsoft has ended mainstream support for SharePoint Server 2019 and will end extended support in July 2026. SharePoint Server Subscription Edition provides a bridge, but Microsoft's investment is overwhelmingly focused on SharePoint Online — including AI features like SharePoint Premium (formerly Syntex), Copilot integration, and continuous feature updates. Organizations staying on-premises face increasing security risk, feature gaps, and rising infrastructure costs. The exception is organizations with strict data sovereignty requirements or air-gapped network mandates that prevent cloud adoption entirely.
Over three years for 500 users, SharePoint on-premises typically costs $580,000-$780,000 (server hardware, SQL Server licensing, Windows Server CALs, SharePoint licensing, IT staff, power, patching, and disaster recovery). SharePoint Online via Microsoft 365 E3 costs approximately $648,000 over three years ($36/user/month x 500 users x 36 months) — but this includes Exchange Online, Teams, OneDrive, and the full M365 suite. When you factor in the total bundle value and eliminated infrastructure costs, SharePoint Online delivers 30-50% lower TCO for most organizations.
SharePoint Server 2019 mainstream support ended on January 9, 2024. Extended support ends on July 14, 2026. After extended support ends, Microsoft will no longer provide security patches, bug fixes, or technical support. Organizations still running SharePoint 2019 after July 2026 face unpatched security vulnerabilities and compliance audit failures. SharePoint Server Subscription Edition (SE) is available for organizations that need on-premises deployment, but Microsoft strongly recommends migration to SharePoint Online for full feature access and continuous updates.
Yes. SharePoint hybrid architecture connects your on-premises SharePoint farm to SharePoint Online, providing a unified search experience, hybrid OneDrive redirection, hybrid taxonomy, and hybrid Business Connectivity Services. Hybrid is often used as a transitional architecture during migration — allowing users to access both environments through a single entry point while content is gradually moved to the cloud. EPC Group recommends hybrid as a migration accelerator rather than a permanent architecture, since maintaining both environments doubles operational complexity and cost.
Migration timelines depend on data volume, customization complexity, and organizational readiness. For a 500-user organization with 2-5 TB of content, minimal customizations, and no InfoPath forms: 8-12 weeks. For a 2,000-user organization with 10-20 TB, moderate customizations, InfoPath forms, and custom workflows: 16-24 weeks. For a 10,000+ user organization with 50+ TB, heavy customizations, third-party integrations, and compliance requirements: 6-12 months. EPC Group uses a phased migration approach that keeps users productive throughout the transition, with typical migration throughput of 1-2 TB per day using SharePoint Migration Tool (SPMT) or third-party tools like ShareGate or AvePoint.
InfoPath forms and SharePoint 2010/2013 workflows do not migrate directly to SharePoint Online. InfoPath forms must be rebuilt using Power Apps (Microsoft's recommended replacement) or converted to modern forms. SharePoint Designer workflows must be rebuilt in Power Automate (formerly Flow). Custom-coded farm solutions (.wsp) cannot run in SharePoint Online and must be rebuilt as SharePoint Framework (SPFx) solutions or Power Platform apps. EPC Group performs a full customization inventory before migration, identifies replacement paths for every component, and prioritizes rebuilds based on business criticality.
SharePoint Online meets or exceeds the security posture of most on-premises deployments. Microsoft 365 holds SOC 1, SOC 2, SOC 3, ISO 27001, ISO 27018, HIPAA BAA, FedRAMP High (GCC High), and HITRUST certifications. Data is encrypted at rest (BitLocker + per-file encryption) and in transit (TLS 1.2+). Microsoft Purview provides data loss prevention, sensitivity labels, retention policies, and eDiscovery. Conditional Access and Entra ID provide zero-trust access controls that are difficult to replicate on-premises. For most regulated industries — healthcare, financial services, government — SharePoint Online with proper configuration is more secure than an on-premises farm managed by a small IT team.
SharePoint Premium (formerly SharePoint Syntex) is Microsoft's AI-powered document intelligence platform. It provides document understanding models that automatically classify, extract, and tag content using AI. Features include prebuilt models for invoices and contracts, custom document processing models, content assembly (template-based document generation), and eSignature integration. SharePoint Premium is exclusively available in SharePoint Online — there is no on-premises equivalent. Organizations staying on-premises forgo all AI document intelligence capabilities, which represents an increasing competitive disadvantage as AI-driven document processing becomes standard in enterprise operations.
Large-scale migrations require a structured approach: (1) Discovery and assessment using tools like SharePoint Migration Assessment Tool (SMAT) to identify blockers, (2) Content cleanup to reduce migration volume — most organizations have 30-40% redundant, obsolete, or trivial (ROT) content that should not be migrated, (3) Architecture design mapping on-premises site collections to SharePoint Online sites and Microsoft 365 Groups, (4) Pilot migration of 2-3 representative sites to validate the process, (5) Wave-based migration executing 5-10 TB per wave with user acceptance testing, (6) Cutover and decommissioning. EPC Group has migrated environments exceeding 100 TB for Fortune 500 clients using this methodology.
EPC Group provides fixed-fee SharePoint migration assessments that deliver a complete migration plan, TCO analysis, customization inventory, and timeline — so you can make a confident decision backed by data.
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