Pardon me. I meant to say Windows 7 installed COMPUTERS, but carry on.
Even then there’s no warehouses filled with computers. Dell and HP makes most of their machines to order and they use ‘just in time’ manufacturing techniques to save on warehousing costs.
All of this means that Dell is sticking with Windows 7 because it is a better OS than Windows 8 for most users (I agree), not that they’re married to it because they invested in a bunch of stuff they need to sell off.