Hi,
Data destruction techniques vary depending on the type of data object being destroyed, whether it be whole subscriptions themselves, storage, virtual machines, or databases.
If a subscription has expired or is terminated, all associated customer data (including storage accounts) is held for a period before it is actually deleted in order to recover from accidental subscription cancellation. That suspension period is 90 days. In
no more than 180 days after expiration or termination, Microsoft will disable the account and delete customer data.
http://blogs.msdn.com/b/walterm/archive/2014/09/04/windows-azure-data-cleansing-and-leakage.aspx
http://azure.microsoft.com/en-us/support/trust-center/privacy/
Regards,
Mekh.