Intranet content migration governance and procurement checklist

A battle-tested checklist refined across 50+ enterprise migrations to migrate terabytes of file shares and legacy SharePoint farms to SharePoint Online with zero business downtime.

Migration Readiness Score 0% Complete

Track completion across all five migration phases.

1 Phase 1: Discovery & Technical Audit

Inventory & Sizing: Quantify total site collections, sub-sites, list items, total storage volume (GB/TB), and version history depth.

Path Length & Blocked Characters: Scan file hierarchies for file paths exceeding 400 characters and unsupported ASCII characters.

Custom Code & InfoPath Audit: Catalog legacy Sandbox solutions, farm solutions, SharePoint Designer 2010/2013 workflows, and InfoPath forms.

2 Phase 2: Target Information Architecture

Flat Hub Topology: Replace deeply nested subsite hierarchies with modern flat site collections associated with central SharePoint Hub Sites.

User Identity Mapping: Create CSV user mapping files reconciling on-premise Active Directory sAMAccountName with cloud Entra ID UPNs to preserve Created/Modified metadata.

3 Phase 3: Migration Execution & Delta Syncs

Baseline Data Migration: Perform bulk initial data copy across multiple migration agents running ShareGate or SPMT to achieve high-throughput cloud ingestion.

Delta Differential Syncs: Run incremental nightly delta jobs capturing only modified or newly created files, reducing cutover delta duration to under 2 hours.

4 Phase 4: Cutover & Validation

Lock Source to Read-Only: Switch on-premise databases or network shares to read-only during the cutover window to prevent split-brain updates.

DNS & URL Redirection: Implement IIS HTTP 301 redirection rules routing legacy bookmarked intranet URLs to corresponding modern SharePoint Online sites.

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Zero-Downtime SharePoint Migration Technical Playbook

Migrating terabytes of legacy on-premises SharePoint data to Microsoft 365 requires methodical planning, automated discovery, and zero-downtime cutovers. Here is our 5-phase migration framework.

Phase 1 & 2: Assessment & Remediation

Perform comprehensive farm inventory audits to identify custom server-side solutions (WSPs), unsupported InfoPath forms, workflows, and URL paths exceeding 400 characters. Normalize file paths and resolve orphaned user SIDs prior to data transfer.

Phase 3: High-Throughput Bulk Migration

Leverage Microsoft SPMT or ShareGate with Azure-hosted migration agent clusters. Execute bulk initial copies during off-peak hours using Azure storage staging containers to avoid API throttling limits.

Phase 4: Delta Synchronization & Cutover

Run continuous incremental delta passes to synchronize only modified items. Schedule final weekend cutovers where source databases are placed in Read-Only mode, final deltas are completed in under 2 hours, and DNS records are updated.

Phase 5: Post-Migration Validation & Redirects

Validate SHA-256 file checksums, metadata fidelity, and permission matrices. Deploy IIS HTTP 301 rewrite rules on legacy web servers to route bookmarks to modern SharePoint Online communication sites.

Post-Migration Validation & Performance Verification Checklist

Fidelity & Checksums

Execute automated PowerShell scripts comparing source and target item counts, folder structures, and SHA-256 hashes to guarantee zero file loss or corruption.

Search & Indexing Health

Trigger full crawl re-indexing of migrated document libraries, verify Managed Property mappings in the SharePoint Search Schema, and validate custom search refiners.