Kind of refreshing to hear it was pretty much the other way around from what's been reaching my attention before.

the whole point of the ISO standard document format was so that documents written in one program would be readable in another, not to mention that future programs would be able to read documents written in older programs.

.... mostly it relates to governmental archiving, and solving the problem of federal services having to maintain obsolete machines simply to read old documents.

but it also is to combat Microsoft's monopoly of the market and make it easier for Mac users and MS Office users to communicate. (if you have been to collage in the last 5 to 10 years you know how big of an issue that is)

forcing through a standard, dropping support for said standard to produce another (non open) standard by the same name, making it so that only the new Office can open that format, then altering the format with random bits from the first format once people manage to make progress on reverse engineering the format is not supporting the ISO standard and intentionally disrupting the process of getting everyone on a universal format.