They make money selling support! Winds up costing corporate IT the same as Windows.
The problem with LINUX is that if the admin screws up royally, he has no one to blame. If he screws up while using Windows, he can scapegoat Microsoft and maybe keep his job.
Windows has unfairly become the whipping boy for incompetant admins.
“They make money selling support!”
I’m not just talking about those companies. There are a lot of companies, like google or tivo, that use linux to add value to their products.