I would argue that's a Microsoft problem... I don't think office files are even compatible with their own standard: http://en.wikipedia.org/wiki/Office_Open_XML .
This is also Microsoft's problem.
Also, the cost of a Windows+Office license is so small that pretty much any company will happily buy it for an employee.
You can't really fix something when the spec is incomplete, ambiguous, and refers to non-disclosed information, all the while multiple official implementations exist that contradict both themselves and the spec about the behavior to have.
Now what about Microsoft implementing ODT correctly?
EDIT: Unless, of course, they have a private internal standard...
Note: Both google docs and iWorks handle this significantly better.