Dell and many other service providers bundle Microsoft Windows when you buy a computer system (even if you didn't ask for it).
So you often pay for Microsoft Windows and aren't going to use it. This article shows you how to return your unused Windows license and get your money back, freeing yourself from the Windows tax.
From the article:
I recently purchased a new laptop computer from Dell. As a GNU/Linux user and believer in Free Software, I knew from the start that I wasn't going to run Microsoft Windows. Unfortunately, Dell didn't offer this laptop with Ubuntu or a no-OS option, so I tried getting my Windows refund from Dell after the purchase. After working with customer service, I received a refund of $52.50. In the course of getting my refund, I found some techniques worked better than others. By knowing what works, you may be able to get your refund quickly and easily
a) You need to spend some time and energy to get back $50.
b) Most CTO or managers are not going to ask for 1000 PCs refund. A better option is allow users to select OS.
c) However many computer vendor, especially Dell's "terms of sale" clearly say that the operating system is bundled software and may only be refused/returned if the entire system is returned.
My suggestion is simply - give end user an options such as Desktop should bundled with:
(2) No os
(3) Microsoft Windows etc
What do you think?