Microsoft also doesn’t elaborate on what it means by Windows 11 “compatibility issues,” so this is a matter of guesswork. However, it’s possible to imagine that new features that assume a TPM is available could cause instability on a machine lacking this facility. It could also affect drivers for older hardware no longer supported in Windows 11, although this would be likely to be an issue over the longer term.
Meet the TPM
Microsoft’s minimum requirements for Windows 11 cover several hardware components, including having enough RAM and a powerful enough microprocessor. But the most contentious issue is whether a PC contains or supports a Trusted Platform Module (TPM), specifically version 2.0, released in 2014.
A TPM is a secure enclave for storing data such as cryptographic keys, certificates, and biometric information fundamental for the security of a PC, including those required for low level PC checks such as Secure Boot, or for the use of Microsoft’s BitLocker in its more secure mode. Having one is somewhere between a good idea and essential, as more and more software systems going forward assume one will be there at the root of trust. For a summary of the arguments in favor of upgrading to a system with TPM 2.0, Hosking’s blog is a good place to start.
