Windows CardSpace

Windows CardSpace is a Microsoft.NET Framework version 3.0 software client that is designed to let users provide their digital identity to online services in a simple, secure and trusted way. CardSpace is an implementation of an identity selector on Microsoft Windows. It pops up when a user needs to authenticate themselves to a website or a web service. CardSpace was formally called Infocard. It’s widely expected that CardSpace will replace MSN Passport.