I have a 'data health' project which requires excel as a final output. However the requirements are in my opinion ill suited to VBA, it just does not scale to the job properly. I plan to write in C++ for a quality solution - The actual processing and 'tool' spec is nailed on for it. Can anybody point me to a library that is free and allows me to talk to excel once processing is over? I would like access to excel formatting and worksheets, save in proprietary formats. I have checked a few things out but any suggestions? Is there any e.g. open source, good quality library around?