In defense of the Microsoft monoculture

Rob Enderle writes: Two high-profile organizations recently argued that diverse environments are inherently more secure than “monoculture” (read: Microsoft-only) environments. They argue that an organization that deploys multiple computing platforms will be inherently more secure than an organization running a single platform on all systems. While they admit costs will go up, they argue that increased security will be worth it. These arguments were put forward by Gartner and, separately, a panel hosted by the anti-Microsoft Computer & Communications Industry Association.
But there is no evidence that either party has actually analyzed the cost of diversity or quantified the risks of diversity. It appears clear they came up with the solution and then fit the facts of the problem into an argument that supports that conclusion.