This book serves as a comprehensive guide to prepare you for the Microsoft Identity and Services exam, which focuses on the core identity and security aspects of a Microsoft 365 tenant. The exam MS-100 tests your proficiency in Azure AD authentication types, user management roles, access management, and workload applications. This book follows the published MS-100 blueprint, which covers identity and identity synchronization concepts, administrative roles, and crucial security topics such as self-service password reset, Azure AD password protection, and multifactor authentication. You'll gain insights into application and authentication concepts, including OAuth application request management, enterprise application configuration, the benefits of Azure AD Application Proxy, and deploying Microsoft 365 apps. The book also delves into passwordless sign-in methods and provides overviews of configuring Exchange Online, Microsoft Teams, SharePoint Online, and OneDrive for Business in both cloud-only and hybrid deployments. You'll be able to assess your knowledge retention at the end of each chapter. By the end of this MS-100 study guide, you'll have built the knowledge and skills to pass the MS-100 exam and be able to ensure thorough preparation with the help of practice exam questions.