This book will introduce readers to Microsoft security solutions. It covers Microsoft Defender, Microsoft Entra ID, and Microsoft Purview. Readers will learn how they can protect their organization across different attack vectors such as email, identity, data, endpoints, and applications. It discusses how to protect the user identities using Microsoft Entra ID, protect devices and applications using Microsoft Defender and Microsoft Sentinel, and protect organization data using Microsoft Purview. With a focus on real-world scenarios, hands-on labs, and expert guidance, cybersecurity professionals will gain a deep understanding of Microsoft security solutions and how to use them to protect their organizations from bad actors.