When you complete a form that is based on an InfoPath 2007 form template, and then you sign the form by using a valid digital certificate, the form is not changed. If you want to view or print the form when the digital certificate expires, install hotfix 956314. Then, to enable the hotfix, add the AllowExpiredCertOnXmlValidate registry entry. To do this, follow these steps.
Install hotfix 956314.
For more information, click the following article number to view the article in the Microsoft Knowledge Base:
Important This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base: