1. Windows comes pre-installed. That means >99% of users (and I mean this literally) will not even consider running anything else (probably they don't even real

1. Windows comes pre-installed. That means >99% of users (and I mean this literally) will not even consider running anything else (probably they don't even realise there's such a thing as not-Windows on a PC). 2. Enterprise software runs on Windows, that creates enough lock-in for Windows to always be a majority.