Dealing with docx documents is still a pain considering number of computer users using old Microsoft Office software. In case you have received a docx file in an email and want to quickly read it – perform quick online format conversion to doc format and open the converted file in your old Microsoft Office software.
Related - Open Docx documents as HTML in Gmail, No hack !
Zamzar is best web service to perform such conversion. Just hit the browse button, select the file format as doc, enter your email address and hit the convert button. You should receive the converted file in your email in NO time (it for sure is quick).
Incase you do not have any Microsoft Office software installed on the computer, you can select TXT as final format and later open it in notepad on your computer. This is one of the 5 ways to open docx document, discussed earlier – take your pick!