Does anyone know who actually deploys Windows based cloud/Internet-facing systems? All the big corporate IT shops I've consulted for only used Windows servers to support Windows clients and that kind of stuff doesn't move to the cloud well. All the big Internet companies (Google, Facebook, etc) deploy on Linux as far as I've seen. Most startups I've heard about deploy on Linux VPS/Heroku/AppEngine type infrastructures. I also though most of the 3D rendering was being done on Linux but maybe that is not the case.

The only example I've seen of windows deployment was dpreview.com, and the comments I read from them were in the line of "it's not as bad as everyone says it is and we're familiar with the stack so we use it".

Is windows a large percentage of EC2 for example? I tried to google for that but couldn't find anything.