Which action is not required to allow customers to log in and view solutions on a corporate site?

In order to enable customers to log in and view solutions on a corporate site, certain configurations and setups are necessary. Among the options presented, the presence of a self-service portal, Force.com Sites implementation, and customer portal setup are directly associated with facilitating customer access to information and resources online.

A self-service portal is essential as it allows customers to independently search for solutions, create cases, and engage with available resources without requiring direct support interaction. Force.com Sites implementation is critical because it enables organizations to create public websites or applications that integrate with Salesforce, providing a tailored experience for customers. Likewise, customer portal setup is also crucial because it allows customers to have personalized access to their data and available solutions.

Web-to-Case configuration, while beneficial for capturing customer inquiries directly into the Salesforce system, is not a prerequisite for allowing customers to log in and view solutions. It is primarily focused on case creation rather than providing access to solution viewing on a corporate site. Therefore, while it can enhance customer support, it is not necessary for the specific action of logging in to access solutions.