Glad to see .docx formats taking over... NOT! :)
I received an email yesterday from a coordinator of a program that Susan and I were participating in. In the email was an attachment of the course evaluations. Apparently the leader is running the latest and greatest version of Word, and sent the attachment out in the .docx format. I tried opening it in the version of Word I have running on this machine (2002), and no luck. Every option it gave me produced unreadable text. Granted, I didn't try very hard to get around it either. :)
This morning we get a follow-up email... Apparently everyone was having problems reading his attachment, so he just embedded the results in the email.
All hail OOXML! :)