Is it a supported configuration to be run a SQL 2008 reporting services server with a SQL 2005 database server?
Either way, where can I find supporting documentation?
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Unfortunately SQL Server Reporting Services might fail to work successfully even if the database version is different in service pack or build number detail.
In such a case you should upgrade the report server database.
So it is not possible to make it work a 2008 on a 2005 db
For SSRS you can find resources at SQL Server Reporting Services
Ignore the answers above yes youo can, check this on sql server 2008 r2.. http://msdn.microsoft.com/en-us/library/ms157300.aspx (firstname.lastname@example.org)