Is the .accdb supported as a database source?
We currently do not support connecting to Access 2007 files directly, but you can still connect via ODBC if you have the driver.
We're making a small change in the code that will check for the .accdb extension that will assume you've installed this driver. This change will be available in a couple of weeks.
Support for Access 2007 (*.accdb) is now available in Centerprise 5.1.