Microsoft Root Certificate Authority 2011cer Work File

Yes — is a legitimate Microsoft root. However, like any root CA, it presents a risk if compromised. Microsoft protects it with:

If this root certificate is missing, expired (not possible until 2036), or untrusted, you may see: microsoft root certificate authority 2011cer work

It ensures that only trusted, digitally signed firmware and bootloaders (like the Windows Boot Manager) execute during the system's startup sequence. Yes — is a legitimate Microsoft root