Testing out Report Builder in SQL Server 2008 RTM proved uneventful. The good news was that everything worked, even after an in-place upgrade.

Report Builder RC0 was first released as part of SQL Server 2008 RC0, but it was not included in SQL Server 2008 RTM.

In SQL Server, the integration process requires changing the Report Server settings to run in SharePoint Integrated mode. This mode ensures full report access and delivery to Report Server content ...