There is another twist to this in that the OOXML format didn’t actually define the bugs in the format and MS Office itself didn’t actually follow the officially defined specification they pushed through. This inevitably led to every product that tried to make use of the official spec (e.g. Open Office) failing to be compatible with MS Office. It took the open source devs many years to properly duplicate the buggy mess that is the real MS Office formats.
There is another twist to this in that the OOXML format didn’t actually define the bugs in the format and MS Office itself didn’t actually follow the officially defined specification they pushed through. This inevitably led to every product that tried to make use of the official spec (e.g. Open Office) failing to be compatible with MS Office. It took the open source devs many years to properly duplicate the buggy mess that is the real MS Office formats.