If you find yourself on an older system (like Windows 7) where this certificate is missing, you can install it manually:
As Microsoft continues to evolve its PKI with newer ECC and RSA roots, the 2011 version will eventually be deprecated. But for now, when you see that .cer file, recognize it as a pillar of digital trust. Treat it with respect, never delete it, and always ensure your systems receive root certificate updates via Windows Update. microsoft root certificate authority 2011.cer