Microsoft is driven by internal politics
From the article:
"This, in turn, lets Microsoft "respond to the inevitability of open source in their market without constant push-back from cautious and reactionary corporate process."
Microsoft is very insular. Most of their actions are the result of internal political fights. The winner is the best politician, not the best idea. So the explanation of why Microsoft is creating a wholly owned subsidiary to deal with open source is hidden somewhere in the labyrinth of Microsoft political infighting. If the action makes sense to people outside of Microsoft that is entirely coincidental.
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Steve Stites