TextExporter is a US$ 19.00 plug-in for InDesign and InCopy CS, CS2, CS3, CS4 or CS5. It allows you to export all the text from an InDesign document concatenated into a single RTF file, grouped into a natural reading order. Even if text frames are not threaded together, the exported RTF file will have all the text in the proper order, which largely removes the need to manually clean it up before handing it over to a Microsoft Word user.
Read all about it at
https://www.rorohiko.com/wordpress/indesign-downloads/text-exporter/