A Strategic Comparison of Windows Vs. Unix
"[Employee name]: Here is the new system. Here is the documentation and a week's training. Learn it or find another job." It's just as easy as that. If an employee is not willing or able to learn a different system because it's 'different than my home system' or is something 'I've never used before', then said employee can very happily seek employment elsewhere.
As far as students are concerned, fuck 'em. They're in *college* for Jebus' sake. Doesn't that imply that they possess at least a modicum of intelligence? Oh, wait. I forgot. It's not PC to refuse admittance to people who can't pass 050-level mathematics, english and history courses.