> Back when they were quarreling over the standardization of OOXML, instead of pushing their own proprietary* desktop format

ODF was developed by a committee and predates OOXML by years and it was standardized by ISO before OOXML was even announced.

That's not pushing their own proprietary format. That's just using the existing ISO standard and not switching to a different, far more complex standard that served little purpose.

Hell even IBM threatened to leave ISO wholesale over Microsoft ramming OOXML through the standards body.