No Windows. How cool wouldn't it be if there was a single place on earth where they didn't have a monopoly on OSes for generic x86?
It's the reason why Microsoft has always turned a blind eye to the extreme Windows piracy in China. If the Chinese couldn't pirate it (somehow), then Windows would have a much smaller market share, perhaps of 50 or 60 percent. And Linux would have a thriving ecosystem of programs. The lack of that is why Windows has such a strong lock-in now.
Macs are not an option, and I really doubt 40-50% of Chinese users would start using Linux.