InfoCard has officially been renamed this week. It is now Microsoft CardSpace (WCS). As with the rebranding of Indigo to Windows Communication Foundation or for old schoolers like Thunder to Visual Basic, this is nothing to be concerned about.
This is just a natural transition from an internal, pre-release codename to a the official product name.
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Disclaimer The opinions expressed herein are my own personal opinions and do not represent my employer's view in anyway.