Oh please coming from a long time linux and freebsd user.
The costs to fly consultants to fix broken IE specific sites like SAP, java applets that look for XP and crap out on other platforms, wine bugs, lack of AD support for lockdowns, and help desk Temps to sort through the angry users, documents created with Libre office looking funny to potential clients with Office, are pure madness to consider! Don't give me the garbage about how users were supposed to save as .docx with no macros. Many are drooling idiots who will want to reprimand your ass for ca using this etc. Wine config? Yeah good luck with a 1,000 users including HR who have a weird java applet where people don't get paid if an error arises ;-)
I am not saying this as a troll. Linux has it's uses for specialized servers.
But if people wanted to be freed they would have last decade. Windows is reliable now since NT came and gets shit done