SSRS 2008 R2 – Subscribe facility
Which version of SSRS 2008 do you need to have before users can subscribe to reports
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SQL Server Standard and higher allows users to subscribe to reports. Perhaps you’re thinking about Data Driven Subscriptions? That requires Enterprise.
I believe you need Standard Edition for standard subscriptions. However if you want to utilise data-driven subscriptions, you will need Datacenter or Enterprise editions.
Check out http://www.microsoft.com/sqlserver/en/us/product-info/compare.aspx for comparison table (SSRS functionality is third from the bottom).