Arkadian Cybersecurity successfully led the migration of a growing business from legacy email and file systems to Microsoft 365 Business Premium. The project included securely transferring user mailboxes, shared drives, and calendars from a hybrid setup involving Google Workspace and on-premise solutions. We ensured data integrity, minimized downtime, and provided a seamless onboarding experience for all users. Our team also configured security features such as MFA, conditional access, and data loss prevention (DLP) policies as part of a comprehensive post-migration hardening process. The result was a smooth transition to a modern, secure, and fully cloud-based productivity environment tailored for the client's operational needs.