Format wars: New Microsoft format is dead on arrival
Once upon a time, for a period of about 8 years, picking a document format was safe and easy: save it as a Word document, a .doc file. The vast majority of businesses could open, edit, and print it with no difficulty whatsoever.
This mythical golden age of Word arose after Microsoft conquered the world of Word Perfect and Lotus 123 by bundling a “good-enough” version of each into a single package, Microsoft Office. After a few generations of painful Office upgrades where every new version had a slightly different file format, Microsoft finally matured into a format that it kept stable for three versions in a row—Office 97, Office 2000, and Office XP. And the overall interface has stayed stable much longer than that—there weren't any dramatic changes to the way you use Word between version 3 (when I started using it, back somewhere around 1987 on a Mac) and Office XP, in 2003.
With Office 2007, Microsoft completely changed the interface to its new “Ribbon” style. It also introduced a whole new file format. And now, only a year later, the new format is obsolete. Yet businesses are unknowingly starting to use this new docx format, not understanding that there are only a couple of minor advantages it has, while having several enormous drawbacks.