Discovery mapped 120+ servers and 60 applications. We established an Azure landing zone (policy, RBAC, Key Vault, Backup Vault), configured WAF/Front Door for web traffic, and used Terraform for IaC with GitHub Actions CI/CD. A four-week pilot validated performance, followed by phased migrations by domain (web, ERP, analytics). Cutover occurred over a single weekend with rollback plans that weren't needed. Staff received role-based training; runbooks and dashboards were handed over to IT ops. Post-go-live, autoscaling absorbed peak promotions; page response times improved and nightly jobs finished 52% faster.