# SharePoint On-Premises to Cloud: Migration Strategy Guide for IT Leaders | AvantIT > A practical decision framework for CTOs and IT Directors planning SharePoint migration to Microsoft 365. Real timelines, costs, and risk mitigation strategies. Canonical: https://www.avantit.pt/en/blog/sharepoint-migration-cloud-strategy-guide/ Source: AvantIT — https://www.avantit.pt (Microsoft Solutions Partner, Matosinhos, Portugal) --- [Back to blog](https://www.avantit.pt/en/blog/) ![SharePoint On-Premises to Cloud: Migration Strategy Guide for IT Leaders] SharePoint # SharePoint On-Premises to Cloud: Migration Strategy Guide for IT Leaders ![Arsénio Ferraz] Arsénio Ferraz 2026-02-23 10 min SharePoint on-premises reached end-of-support timelines, but migration to Microsoft 365 isn't just a technical lift-and-shift—it's a strategic transformation that requires careful planning, risk management, and executive buy-in. ## Why Migration Urgency is Real ### Support and Security Timeline Pressure Microsoft’s support lifecycle for SharePoint Server versions: - SharePoint 2013 : Mainstream support ended April 2018, Extended support ends April 2023 - SharePoint 2016 : Mainstream support ends July 2021, Extended support ends July 2026 - SharePoint 2019 : Mainstream support ends July 2024, Extended support ends July 2029 Running unsupported versions exposes organizations to: - Security vulnerabilities with no patches - Compliance and audit risks - Inability to integrate with modern Microsoft 365 features - Difficulty recruiting talent skilled in legacy platforms ### The Business Case Beyond Compliance At [Avantit](https://www.avantit.pt/en/), we help clients build comprehensive business cases that go beyond “we must migrate”: Cost Savings : - Eliminate datacenter costs ($50K-200K annually for mid-sized farms) - Reduce IT staff time on infrastructure maintenance (1-2 FTEs typically) - Remove upgrade and patch management overhead Business Enablement : - Modern collaboration with Teams integration - Mobile access and external sharing - AI-powered search and content discovery - Integration with Power Platform for automation Risk Reduction : - Built-in disaster recovery and business continuity - Enterprise-grade security and compliance tools - Automatic updates without downtime ## Migration Approaches: Three Paths with Different Trade-offs ### Approach 1: Lift-and-Shift (Fastest, Highest Technical Debt) Timeline : 2-4 months for typical 2TB environment Best for : Organizations under urgent timeline pressure (support ending soon) Process : - Inventory all sites, libraries, workflows, customizations - Use migration tools (ShareGate, SharePoint Migration Tool, AvePoint) - Move content “as-is” to SharePoint Online - Address broken customizations post-migration Pros : - Fastest path to cloud - Lowest initial cost - Minimal business disruption Cons : - Carries forward all legacy baggage - InfoPath forms and legacy workflows break - Custom solutions require rework - Misses opportunity for modernization Real Cost : $30K-80K for consulting + tools (100-500 users) ### Approach 2: Redesign and Migrate (Balanced) Timeline : 4-8 months for typical environment Best for : Most organizations seeking balance between speed and modernization Process : - Audit current state and identify modernization opportunities - Redesign site architecture for modern SharePoint patterns - Convert InfoPath forms to Power Apps - Rebuild workflows in Power Automate - Migrate content to new structure - Train users on new paradigm Pros : - Modernizes while migrating - Removes legacy technical debt - Improves user experience - Sets foundation for future capabilities Cons : - Longer timeline - More change management needed - Higher initial cost - Requires careful planning Real Cost : $80K-200K for consulting + tools (100-500 users) ### Approach 3: Transform to Microsoft 365 Ecosystem (Strategic) Timeline : 6-12 months Best for : Organizations ready for comprehensive digital workplace transformation Process : - Rethink collaboration strategy (not just SharePoint) - Design integrated Microsoft 365 experience (Teams, SharePoint, Power Platform) - Migrate content to appropriate modern platforms - Implement governance and information architecture - Build Center of Excellence for ongoing optimization Pros : - Maximizes Microsoft 365 investment - Creates modern digital workplace - Enables new ways of working - Strong governance foundation Cons : - Longest timeline - Significant change management - Highest consulting investment - Requires executive sponsorship Real Cost : $150K-500K for comprehensive program (100-500 users) ## The Decision Framework: Choosing Your Path ### Assessment Questions for IT Leaders 1. How urgent is your timeline? - Support ending in < 12 months → Consider Lift-and-Shift or Balanced - Support ending in 12-24 months → Balanced or Transform - Support ending in 24+ months → Transform 2. What’s your customization complexity? - Minimal (mostly out-of-box) → Lift-and-Shift viable - Moderate (some InfoPath, workflows) → Balanced recommended - Heavy (custom solutions, integrations) → Transform or Balanced 3. What’s your change capacity? - Low (IT stretched thin) → Lift-and-Shift, address debt later - Moderate (can dedicate resources) → Balanced - High (dedicated transformation team) → Transform 4. What’s your strategic vision? - Maintain status quo → Lift-and-Shift - Modernize collaboration → Balanced - Reinvent digital workplace → Transform ## Real Migration Timelines and Resource Requirements Based on Avantit’s experience with 50+ migrations: ### Small Organization (100-250 users, 500GB-2TB) Lift-and-Shift : - Timeline: 8-12 weeks - Internal FTE: 0.5 (IT lead) - External consulting: 200-300 hours - Migration tools: ShareGate or SPMT Balanced : - Timeline: 16-24 weeks - Internal FTE: 1.0 (IT lead + power users) - External consulting: 400-600 hours - Migration tools: ShareGate + Power Platform licenses ### Mid-Size Organization (250-1000 users, 2-10TB) Lift-and-Shift : - Timeline: 12-20 weeks - Internal FTE: 1-2 (IT team + project manager) - External consulting: 400-800 hours - Migration tools: Enterprise migration platform Balanced : - Timeline: 24-40 weeks - Internal FTE: 2-3 (IT team + business analysts + change lead) - External consulting: 800-1500 hours - Migration tools: Enterprise platform + Power Platform ### Enterprise (1000+ users, 10TB+) Balanced or Transform : - Timeline: 40-52 weeks - Internal FTE: 4-6 (dedicated transformation team) - External consulting: 1500-3000+ hours - Migration tools: Enterprise platform + full Microsoft 365 stack ## Common Migration Risks and Mitigation Strategies ### Risk 1: Broken Customizations Impact : Custom web parts, event receivers, InfoPath forms fail in cloud Mitigation : - Inventory all customizations during planning phase - Classify as: migrate as-is, rebuild modern, retire/replace - Build SPFx alternatives for critical custom web parts - Convert InfoPath to Power Apps (plan 40-80 hours per complex form) ### Risk 2: Workflow Disruption Impact : SharePoint 2010/2013 workflows don’t work in SharePoint Online Mitigation : - Document all active workflows during inventory - Prioritize by business criticality - Rebuild critical workflows in Power Automate (20-60 hours per workflow) - Accept temporary manual workarounds for low-priority flows ### Risk 3: Performance Issues Post-Migration Impact : Users complain about slow sites, search problems Mitigation : - Implement proper site architecture (hub sites, not nested subsites) - Configure search crawl schedules appropriately - Optimize large lists/libraries (use metadata, column indexing) - Set realistic expectations about initial search index build (days to weeks) ### Risk 4: User Adoption Failure Impact : Users continue working around new system, ROI not realized Mitigation : - Start change management early (not just training at go-live) - Identify and train champions in each business unit - Create role-specific training (not generic) - Provide ongoing support channel (not just day-one help) ### Risk 5: Data Loss or Corruption Impact : Critical content missing or damaged post-migration Mitigation : - Multiple test migrations before production cut-over - Maintain read-only on-premises environment for 90 days post-migration - Implement versioning in SharePoint Online before migration - Have rollback plan for critical workloads ## The Avantit Migration Methodology At [Avantit](https://www.avantit.pt/en/), we follow a proven 6-phase approach: ### Phase 1: Discovery & Assessment (2-3 weeks) - Site inventory and usage analysis - Customization and integration audit - User interviews and pain point analysis - Risk and dependency mapping - Approach recommendation and cost model ### Phase 2: Planning & Design (3-4 weeks) - Target architecture design - Migration wave planning (which content when) - Customization redesign specifications - Test plan and success criteria definition - Change management and training strategy ### Phase 3: Pilot (4-6 weeks) - Migrate 2-3 representative sites - Test all migration patterns - Validate customization rebuilds - Conduct user acceptance testing - Refine approach based on learnings ### Phase 4: Wave Migration (8-20 weeks depending on size) - Execute migration in planned waves - Monitor and troubleshoot issues - Provide daily user support - Track success metrics - Adjust approach as needed ### Phase 5: Hypercare (4-8 weeks post-migration) - Intensive user support - Performance tuning and optimization - Address outstanding issues - Knowledge transfer to IT team ### Phase 6: Optimization & Governance (Ongoing) - Establish Center of Excellence - Implement ongoing governance - Plan next evolution (Teams, Power Platform) - Measure and report on realized benefits ## Cost Considerations: Beyond the Migration Project ### Ongoing Microsoft 365 Costs Licensing : - Microsoft 365 E3: $36/user/year - Microsoft 365 E5: $57/user/year - SharePoint Plan 1: $5/user/month (if not buying full M365) Change from On-Premises : - Eliminate: Hardware refresh, datacenter, SQL licensing, backup infrastructure - Add: Per-user cloud licensing, potential egress costs for heavy API usage Net Financial Impact : Most organizations see 20-40% cost reduction vs. on-premises total cost of ownership over 5 years. ### Unexpected Costs to Budget For - Storage overages : Plan for growth, default quotas often insufficient - Power Platform licensing : If rebuilding workflows/forms at scale - Advanced security features : Some scenarios require E5 or add-on licenses - Migration tool licensing : Often charged per user or GB migrated - Extended consulting : Complex issues often require more hours than planned ## The Bottom Line for IT Leaders SharePoint migration is inevitable for most organizations, but the “when” and “how” are strategic decisions with multi-year implications. Good migrations are characterized by: - Executive understanding and support - Realistic timelines (don’t rush what can be done properly) - Balanced investment in technology and change management - Clear success criteria beyond “content moved” Failed migrations typically share: - Treating it as purely technical project - Underestimating customization complexity - Skipping pilot phase - Inadequate user training and support Ready to plan your SharePoint migration? [Contact Avantit](https://www.avantit.pt/en/contact/) for a complimentary Migration Readiness Assessment. In a 2-hour workshop, we’ll: - Review your current SharePoint environment - Identify migration complexity and risks - Recommend the right approach for your situation - Provide high-level timeline and budget estimates - Answer your specific concerns and questions Our assessments are honest and consulting-focused—we’ll tell you if you’re not ready to migrate yet and what to do first. #### Editorial Policy At Avantit, we value authenticity and human expertise. This article was written and reviewed by our experts, ensuring technical accuracy grounded in real-world projects. We do not publish content generated exclusively by AI without validation by one of our consultants. ### Share and Comment Share: [Comment on LinkedIn](https://www.linkedin.com/company/avantit/posts/) ### Enjoyed this article? 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