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Implementing BitLocker is the most effective solution for ensuring that all devices have encryption enabled to protect data. BitLocker is a built-in disk encryption feature for Windows operating systems that encrypts the entire volume of the drive. This means that all data stored on the device is secured, making it inaccessible to unauthorized users, even if the device itself is stolen or compromised.

BitLocker operates at the disk level, which provides robust protection by encrypting not only the files but also the system files and areas of the disk that could store sensitive information. This is particularly important for businesses and organizations that handle sensitive data and need to comply with various data protection regulations.

While Azure Active Directory, Microsoft Intune, and Microsoft Configuration Manager are all valuable tools for device management, they do not provide encryption capabilities in the same direct manner as BitLocker does. Instead, these solutions can manage and enforce policies related to encryption deployment and compliance across devices, but the core mechanism of encryption itself is delivered through BitLocker.