@Trolleur
You and your friend are mistaken. Purchasing new equipment is a capital expense, and software maintenance (including patching) is an operating expense. The two are treated differently. And... if the existing Dell servers have depreciation left, they would likely be sold for less than current value, meaning the company would lose money.
What about the cost of re-training the staff that supports the servers on a completely new platform? If your friend's company is a primarily Windows environment, I seriously doubt that all their internal, critical business applications could easily be ported to OSx, nor could they be without additional high costs.
I could go on and on, but ultimately, I'm not buying what you're selling.
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