Re: !!!!!
macOS is simply Not An Option due to the ludicrously expensive hardware requirements - nobody sane shells out £1000+ for everyone in the company when a £150 PC is more than good enough for the majority of staff.
This is an odd argument. If the cost of business equipment was really a problem, why are company cars nearly always premium brands? Answer: because it's tax efficient and it's similar for equipment: the costs can be offset against tax.
Businesses are, therefore, generally more concerned with the other costs associated with equipment such as training and support. A couple of days training or support callouts can nix any difference in initial outlays due to time lost.
While more and more stuff is moving into the browser, most companies will still rely on some software that only runs on Windows. Where this isn't the case, then stuff is moving to phones and tablets. The biggest reason against Macs for business is probably the difficulty of contracting for fast replacements.