Tools for Excel Format Conversion and/or Comparison

[cxanewman]

I'm wondering if anyone knows of any good tools for converting an excel file in one format (one set of column headers) into another format. For example, if I download a report from a CRM system, such as Salesforce.com and then want to import that file into another system that has a specific set of required columns (say DHL or FedEx), is there a tool that will allow me to map the columns and create the new file? Also, does anyone know of a good tool for comparing two Excel files to find the changes? I’ve found a few, but they aren’t very good. Thanks.