Discussion: What can we do as Linux users and developers to begin to dethrone Microsoft as the go-to enterprise solution for corporate IT backbone?

I am not a developer, but I am an avid Linux user in my personal life. At the office, we use the standard windows server active directory style system. Being exposed to the joy of linux makes me wonder...what can we do to dethrone microsoft in the enterprise solution space? Open source systems should (and in my opinion, are) infinitely better, easier to use, less prone to error, and more robust. What is your opinion?