title: Certificate Expiry for Signed .NET Application
body: <p>So let's say XYZ Soft creates an application, XYZCalc. They build the product, create an MSI and an EXE installer, and put it on the internet. The commercial (not self-signed) cert they use to sign the app is valid for two years.</p>
  <p>XYZ Soft goes under and closes it's doors. However that EXE and MSI is still floating around out there. Four years go by. The cert they used to sign the app has expired.</p>
  <p>QUESTION: Can I still install the application, after four years?</p>