Last week we released a Billing Preview that provided a usage summary to help customers prepare for when billing begins in April. Usage statistics in this billing preview are consistent with our new Connection-based billing for the AppFabric Services
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Read the complete post at http://blogs.msdn.com/netservices/archive/2010/03/16/a-calculator-for-the-windows-azure-platform-appfabric-billing-preview.aspx