Back when Apple was going bankrupt, Microsoft was on the edge of a Monopoly and decided to save Apple in order to keep competition and I don't think they expected Apple to get as big as it has.
Now I am not sure if the Ouya or even the Wii U can be considered competition for the Xbox and Microsoft, if Sony went under would Microsoft help them out like they did apple? Nintendo is on the brink of collapse too but they are holding on.
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[url=http://www.eurogamer.net/articles/2013-11-15-microsoft-congratulates-sony-on-its-ps4-launch]Good guy Microsoft[/url]