You have the basics; just be confident & enthusiastic

You have an MBA, which should give you a solid foundation to branch out into any business-related field.

It seems that your past experience dealt more with tabulating numbers and preparing reports than with analyzing data and providing recommendations for higher-up decision-makers. Therefore, in preparing for the interview, it would be advisable that you play up your general analytical skills while highlighting your experience and success stories in corporate accounting.

To sum up, be confident (again, your MBA education should have equipped you well in the confidence department) and enthusiastic in marketing yourself.