Hi Ramon84,
Microsoft created an infrastructure called Mendocino several years ago for SAP and Office. With the advent of Business Connectivity Services (BCS), Mendocino is becoming obsolete. In MOSS 2007, the Business Data Catalog was the precursor to BCS. You might look at that for some connectors or visit the Winshuttle dot com site and see if there stuff can help. We have Web services (DBXL) and InfoPath plugins (qRules) that connect to SQL to pull data into InfoPath but they don't work with Oracle. If you have a Web service you can do it with the out-of-box features in InfoPath.
Good luck!