Reporting Services Backward Compatibility
For SQL Server 2008 R2, there have been no changes to the content that is listed in this topic.
This section describes changes in behavior between versions of SQL Server Reporting Services. It covers features that are no longer available or are scheduled to be removed in a future release. It also describes fundamental changes to the product that are known to break a custom application that includes Reporting Services functionality.
In this release, the report processing engine has been redesigned to process and render report pages only when they are viewed or exported. For more information, see What's New in Report Processing and Rendering.
In this release, the report rendering object model has been replaced. For more information, see Breaking Changes in SQL Server Reporting Services.