As mentioned, Wordsflow will export your document stories as individual word docs, but not the whole book of indd files in one click. If you are looking for something that will do the whole batch in one step, you might be out of luck. PDF to word might be a good solution, but depending on your intent for having it as a Word doc, it might cause more problems than it solves. It really depends on the document elements. If you just have paragraphs and headings, you will probably be okay. If your document is full of images, captions, footnotes etc. and you are hoping to get a complete .doc that you can just keep on editing and working with just like it was in InDesign, you might be in for some frustrations. It just depends on your intent. Wordsflow is really the best tool for collaborating back and forth between Word and InDesign. But the documents need to be setup with that in mind.
Let me know if you want more info on that process. We do it all the time here for very large reports.
-Dax
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