Microsoft is encouraging approximately 240 million PC owners to recycle outdated devices, as they will not qualify for a free upgrade to Windows 11 without new hardware. The company emphasizes the importance of the Trusted Platform Module (TPM) 2.0, a security chip that determines eligibility for the upgrade and protects sensitive data. TPM 2.0 offers several security benefits, including data encryption, verification of trusted software, detection of physical tampering, and support for advanced security features in Windows 11. Currently, around 240 million PCs are estimated to be ineligible for the upgrade, which may hinder the adoption of Windows 11 and leave many devices vulnerable to cyber threats.