Question:
Which OCR program has the features needed specifically for invoice processing?

Answer:
In order to automate the processing of invoices, you need to have a document automation program that combines OCR with data field recognition, so that in addition to making the text searchable, it can automatically extract text and organize information in a meaningful way. The program that is best for handling invoices and other documents is Trapeze from CVISION.

Check out this link to learn more about the specifics of Trapeze:

http://www.cvisiontech.com/download_main.html