Windows CardSpace, previously known by its code name, InfoCard, is the identity management component in Microsoft's upcoming .NET 3.0. With CardSpace, end users create a digital file on their own computer that includes user-specific information, like a work phone number, e-mail address or snail mail address. Users are able to save several different profiles and use whichever profile is appropriate for a certain situation. For example, if a sales account manager has a rich client application for communicating with customers, the application can be configured to use InfoCard to verify information before it is sent to a customer.
CardSpace is a potential successor to the Microsoft Passport information management system, which stores user information on a database instead of individual machines.