One point that is somehow missing in this thread, yet is implicitly made is: Open source is not the solution to every problem. There are businesses that value

One point that is somehow missing in this thread, yet is implicitly made is: Open source is not the solution to every problem. There are businesses that value the support, packaging, and overall completeness of the .NET stack. Yes, they cost money to deploy, but so do open source alternatives. People will argue that MS will lock you down. Yet, if you start developing under Rails or Django, its pretty hard to move away when things get going.