How to export Pages document to .docx? This question is pretty similar to this one:

How can I save a Pages document to .docx?

Unfortunatly, the answers provided to this old one don't work with:

Mountain Lion        10.8.5
Pages ’09            4.3


I already found a transition path which is going through the following steps:


From Pages export as a .doc,
Open the .doc file with LibreOffice and save it as a .docx file.


Unfortunately, this conversion leads to files containing a lot of useless
list styles which are a real trouble to continue working on the converted file. See this related question on these useless styles:

Get rid of WW8Num* list styles upon exporting from Pages?.



How to export a Pages document under .docx format?
The current Pages beta on iCloud.com gave a very faithful export from Pages > Word .docx format (I shared the document with myself by email, but there may be a more appropriate way for you to do it). You can drag and drop a Pages file from your desktop into iCloud without fear of irreparably converting your original Pages '09 file.