The answer is “Yes”, but it depends on which version of BOXI you are running.
Business Objects Enterprise XI Release 2
Any version of BOXI R2 equal to or greater than Business Objects XI R2 Service Pack 5 includes an Oracle 11g driver. However, if you find your instance is still lurking below SP5 you are not without hope. According to Oracle, 10g drivers can successfully be used to connect to Oracle 11g databases. Business Objects does not support using R2 SP4, or lower, to connect to and Oracle 11g database, but that doesn’t mean that you can’t do it. It only means they won’t take any “Customer Messages” on any issues related to such connections, unless the issues can be recreated on database supported for your BO XI service pack level.
Be sure to check your service pack’s “Support Platforms” for the particular supported implementation of Oracle 11g middleware. For example, XI 3.1 SP2 states clearly for Linux/Unix machines running CMS you must install Oracle 10.2 middleware to connect to your Oracle 11.1 database. 🙂
Business Objects Enterprise XI 3.X
Starting with Business Objects XI Release 3.1 Business Objects has included an Oracle 11g driver. Now if you are on XI 3.0 and you can’t jump to 3.1 just yet, you might want to borrow a trick from Administrator’s of XIR2 systems lower than XI R2 SP5 and use an Oracle 10g driver to connect to that cutting edge 11g database. Just don’t expect BO to support you on that venture.