What do you use to edit Microsoft Word documents (docx)?

LibreOffice is the replacement for OpenOffice and does the same job.

Abiword

Which is a part of gnome-office also supports docx format.

I can certify you that LibreOffice opens correctly Office 2007 Documents (docx) AND saves them correctly. I have tested till now a little over 50 documents which include tables, pictures, a lot of different margins, paragraphs, etc..

They open, read and save correctly. Tested with LibreOffice 3.3.2 and OpenOffice 3.3.0. With OpenOffice you will have a problem that text will move up or down and maybe even change the way they look. But in LibreOffice you will not.

This is a headache i can say goodbye at least for now.

Use the following to install the latest LibreOffice:

• How to install LibreOffice? (replacing OpenOffice.org)

NOTE - When you add the PPA of LibreOffice the option to remove OpenOffice will appear. I recommend you remove it since, trust me, it will be far better.