⚠️ This is not the same as the older “Microsoft Root Authority” (issued 1997) or the “Microsoft Root Certificate Authority 2010” (which was actually an older SHA-1 root). The 2011 version is SHA-256 based.
Windows checks that kernel-mode drivers are signed by a certificate that chains to a trusted root. The 2011cer is one such default trust anchor in fresh Windows 8/10/11 installations.
The “cer” part of your keyword often relates to exporting or using the .cer file for offline trust.
Microsoft Root Certificate Authority 2011.cer is a foundational digital certificate that serves as a "trust anchor" for the Windows operating system. It is primarily used to verify the authenticity of software and system updates provided by Microsoft. GBS.Market Core Functionality