Click here for Tim Dexter’s Oracle BI Publisher Blog for the Siebel CRM/ BIP Integration. There has been some migration work to move some of the more important reports from the existing Actuate formats to the BIP format that Siebel delivers to you the customer.
Oracle DB 11g on same box as 10g with Siebel
As per Siebel System Requirements and Supported Platforms document Oracle Database 11g is not supported, however Oracle 10g can still be used instead. Check the latest on Richard Naszcyniec's Blog regarding Oracle DB 11g on same box as 10g with Siebel.
Click here for details.