While there's no way directly within Travefy to export your itinerary as a Microsoft Word document, there are ways outside of Travefy to do so.
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Here are two:
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The first way is by simply going to pdf2doc.com. This site will allow you to upload your PDF document and export it as a Word document.

The second way is by using Adobe Acrobat Pro DC.

You can do so with the steps here: How do I create a PDF of an itinerary for my client?

Once you've dons so, go to File > Export to > Microsoft Word > Word Document.