I had a few computers (61) on a home-made feeble wooden table. Each had been meticulously cleaned, tested, and had all the “Property-of” stickers from the previous owner removed with a Terrorists' Choice™ brand box-cutter.
I had briefly debated removing also the Windows XP License stickers, but decided against it, as the odds of Microsoft ever again producing any usable OS was nearing 1000:1 against.
Every person I knew cautioned be against keeping the XP Licenses. They all, and I mean all of them, warned and warned and warned me that XP was unstable, and that the computers would crash.
I didn't listen.
Around 2am on October 14, 2009, I booted one of the machines, and, as Windows XP was considering loading, they all came crashing down.
What a mess.
I am absolutely convinced that this would not have happened had I been using Linux on these machines.