Final answer:
BitLocker is the encryption tool that is not available for all versions of Windows, as it is only included in the Pro, Enterprise, and Education editions of the operating system.
Step-by-step explanation:
The encryption tool not universally available for all versions of Windows by Microsoft is BitLocker. BitLocker is a full volume encryption feature included with Microsoft Windows versions starting with Windows Vista. It is designed to protect data by providing encryption for entire volumes. However, it is only available in the Pro, Enterprise, and Education editions of Windows, and not in the Home editions.
EFS (Encrypting File System) is available on most versions of Windows that support NTFS file systems, including some Home versions. The TPM (Trusted Platform Module) is a hardware-based security feature that can work with encryption tools but is not an encryption tool by itself. VeraCrypt is an open-source third-party encryption tool that can be used on various Windows versions, but it is not provided by Microsoft.