Er OK, but we all know how hard it is to make someone change: they have to want to
And being quite comfortable in the windows OS ecosphere, unlikely to make any rash moves
--even if it is rationally beneficial
We can say that Windows OS, since it is a bundled (with OEMs' ) platform, that the cost or ongoing costs are not significant to most users
--and certainly not to any of the usual enterprise customers.
It is abundantly clear that alternatives to wiondows OS exist, and specifically in Linux's case are so alike in normal WIMP mode as to be pretty much indistinguishable for many users
--we can easily jump between Linux and windows: Apple's version is a little different, and I think takes some more getting used to