The left hand invents a bloated file format that makes a 2000-byte document take up a megabyte (or whatever the exact anti-compression ratio is). (For current purposes, we'll say Microsoft Office. Not the only offender, but the most amusing in this context).
Now, the right hand figures out that they don't feel like sending all those bloated bits over the wire. Users will eventually figure out they should be sending plain text, perhaps.
Just sit back and watch the show. If we had *tried* to promote open standards in email, we couldn't have done this well.