Microsoft may be large but last I looked it wasn't a democracy. The top management of any large company is paid to bring a single 'strategic vision' to the company. Microsoft's top management clearly considered attacking open source to be in their interests when they did it previous. Seems like an indication they'll do it again.

The top management of any large company receives input and advise from their underlings. Those underlings are more likely to propose controversial changes to corporate strategy if they aren't getting tarred and feathered by the outsiders they're trying to work with.