ExcelDataTransformer » Use cases » Excel without Excel installed
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The merge has to happen where the files are: a Linux server that will never have Office on it, a build agent, a nightly job that consolidates the day's exports. Scripting it against Excel is not an option - there is no Excel, and installing one is a licence conversation, not a deployment step.
The same problem appears on a single desktop: the file has to be merged once, and the machine does not have Office installed at all.

The workbooks are read and written by the tool itself - Microsoft Excel does not have to be installed, and there is no subscription to maintain. Nothing is uploaded: the files are processed where they already are, which is also why it is safe to run against a folder of customer data.
Automation: command line, scheduled task, saved session. The jobs themselves: merge Excel workbooks, split an Excel workbook. Next steps: DataFileConverter, FileToDB.