This role is a senior Microsoft Office 365 Messaging Solution Architect responsible for designing, migrating, and implementing enterprise-scale messaging and collaboration solutions. The professional will lead complex migrations from on-premises Exchange, Google Workspace, Lotus Notes, GroupWise, and tenant-to-tenant environments to Microsoft 365, while ensuring security, compliance, and data sovereignty (GDPR, Multi-Geo). Key responsibilities include architecting Exchange Online and hybrid coexistence environments, implementing M365 security and compliance features (DLP, Defender, CAS, Conditional Access, AIP), integrating email gateways and archiving solutions, and enabling unified endpoint and mobile device management. The role requires deep hands-on expertise, strong architectural leadership, and the ability to deliver high-quality solutions in large, multi-supplier enterprise environments.