Don't think MS Office is under attack, as I said on the show? People even have native Linux word processors running in Linux environments on Windows!
While that probably was not all that hard, it was not done as an idle excercise in coding. People perceive MS, and their Office franchise in particular, as vulnerable. Competitors are no longer seen as tilting at windmills, so to speak, but as harbingers of some new period in computing. They could be right.