Why Microsoft is threatened by open source

From How Microsoft played the patent card, and failed (The Register: 23 December 2004):

… the joint lead on the Samba project, Jeremy Allison …: “Microsoft has bought off and paid off every competitor it has, except open source. Every single player they could buy out, they did. That leaves Real, and FOSS. And they can’t buy us out, because you can’t buy off a social movement.”