I just had an email discussion with a client who had sent me a file with a .docx extension. My response to him was that .docx was a proprietary Microsoft format and I would prefer it as Open Document Format or even as a .doc so I could read it. His response was that Microsoft was the standard format and I needed to get software that could read it.
It's always difficult having these discussions with clients but I managed to gently walk him through saving the file as a .doc and resending it to me.
So I'm curious about the rest of the world. Has .docx succeeded in becoming the new standard or does the rest of the Lotus world insist on receiving .doc as a file format?