A complete, minute-by-minute SharePoint 2019 → Subscription Edition cutover playbook. Covers the timed execution timeline from T-60 to T+60, all five PowerShell scripts with code and commentary, a GO/NO-GO decision table, and a step-by-step rollback sequence — everything your team needs to run the maintenance window without improvising.
Database Attach
The Complete Guide to Migrating SharePoint 2019 to SharePoint Subscription Edition
SharePoint 2019 extended support ends July 14, 2026 — after that date, Microsoft issues no further security patches. This guide covers the complete five-phase migration path from SP2019 to SharePoint Subscription Edition: discovery, validation, preparation, cutover, and post-migration sign-off. Built from production migration experience, with PowerShell scripts mapped to every phase.