SQL Azure Data Sync Service is free to use for all SQL Azure users, however standard data transfer rates apply if synchronization is occurring between data centers in geographically diverse locations.
For more information, see http://www.microsoft.com/windowsazure/offers/popup.aspx?lang=en&locale=en-US&offer=COMPARE_PUBLIC
It is possible that when we release v1 there will be some charges for using the service. Watch this article for further developments.
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Carsten Siemens edited Revision 5. Comment: fixed typo
Great