Even if you could guide your organization off of Microsoft products, you’d still have to deal with customers, vendors and employees who still use Microsoft stuff. You’d find yourself much like the [British] colonies - independent, but having to trade with the British Empire.

While that’s true to some capacity, it is only the freedom of choice that makes it that way. I may not like Microsoft products, but someone else might. Daily interaction with them cannot be stopped just because we work with different platforms (although if it was upto Microsoft, it would end up that way).

What matters is using the best tool for the job. Sometimes that tool comes from Microsoft, and saying no because of prejudice is a little too jacktastic to be taken seriously.