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We are making it easy to federate your Active Directory with our Services AD so that you can access CRM Online using your AD account as if CRM Online was on your network for example. You can read more about this at this link - http://blogs.msdn.com/dynamicscrmonline/archive/2008/10/31/using-active-directory-for-authentication-to-crm-online-and-ms-online-services.aspx
Also check out these links:
John O'DonnellMicrosoft Dynamics ISV Architect EvangelistMicrosoft Corporation (b) http://blogs.msdn.com/jodonnell