Zero Trust Deployment Assessment is a professional service offered by Onevinn that evaluates Microsoft 365 environments from a Zero Trust perspective. The assessment focuses on three core areas: Identity, Devices, and Data/Information protection. The service provides systematic security evaluations of Microsoft 365 workloads including Entra ID, Exchange Online Protection, SharePoint Online, Microsoft Intune, and OneDrive for Business. The assessment analyzes the current security state of these workloads and compares them against Zero Trust best practices. Deliverables include a detailed technical report that documents each configuration's description, risk level, default state, current state, and recommendations for achieving Zero Trust best practices. The report identifies vulnerabilities and security weaknesses in the Microsoft 365 environment and provides a roadmap for establishing a more secure baseline. The assessment covers identity and access management, endpoint protection, threat protection across Exchange Online Protection and Microsoft Defender services, and information protection settings in Teams, OneDrive, and SharePoint Online. An executive summary meeting is included to review findings with stakeholders. Onevinn developed this assessment methodology over 10 years of experience with both on-premises and cloud security implementations.