I'm just tired. On the last post about having Linux at our work, many people that seems to be an IT worker said there have been several issues with Linux that was not easy to manipulate or control like they do with Windows, but I think they just are lazy to find out ways to provide this support. Because Google forces all their workers to use Linux, and they have pretty much control on their OS as any other Windows system.
Linux is a valid system that can be used for work, just as many other companies do.
So my point is, the excuse of "Linux is not ready for workplaces" could be just a lack of knowledge of the IT team and/or a lack of intention to provide to developers the right tools to work.
A caveat to the cost and expertise aspect: in Europe (or in France at least) for security reasons a company must have the servers secured for all data and authentification, which means any company that's big enough will have its own Microsoft server infrastructure. It takes a big team with this specific expertise to run this infrastructure.