- in-car infotainment systems
- in-flight infotainment systems
- running digital billboards
- mobile phones (hello android, meego, maemo, webos, etc)
- smart televisions
- smart dvd/blue ray players
- etc
You see Linux out in force on all of the above mentioned hardware platforms.
The global Linux installbase absolutely dwarfs Windows in comparison by the simple nature that Linux runs on more hardware architectures than any general purpose operating system ever created (which rules out iTron, eTron, and the tron variants).
Pretty much all of the new IoT "smart devices" are some Linux variant as well. I could go on and on, but really think you miss the forest for the trees here.
Yes Windows beats the snot out of Linux on the Desktop. The desktop is quickly becoming irrelevant as the world becomes more connected.