Azure runs on Linux? What? Small portions do, but it's misleading to say it "runs on Linux".
Edit: clarifying
Edit: clarifying
When you're running Linux on Azure, it's via Hyper-V or rather the Azure flavored form of it. Windows is very much the core of Azure.
Azure Cloud Switch does use Linux - on metal I believe so no virtualization.
Edit: a word
My source: I work for MSFT, not on Azure but I work with their team a lot and I used to work on Windows.