It's seems likely that Sun's IP licence was specifically written to stop Microsoft from doing its well documented embrace, extend, extinguish routine on ODF like they did to Sun's Java. Instead they just emrbraced, extended and extinguished the entire idea of a standard XML office format. Nice work.
Weirdly, Microsoft seem to have incompatibly forked their own OOXML format and are in no rush to fix that now that they've seen off the competitive threat posed by ISO standardisation of a competing format.
StarOffice and Microsoft started work on XML formats at around the same time, and most of the subsequent histories are largely parallel. There was no EEE here.
Weirdly, Microsoft seem to have incompatibly forked their own OOXML format and are in no rush to fix that now that they've seen off the competitive threat posed by ISO standardisation of a competing format.