It works just like on Windows. The rule of thumb is if something can run on Windows (well, in specific Windows Server but that doesn't really matter), it'll run

It works just like on Windows. The rule of thumb is if something can run on Windows (well, in specific Windows Server but that doesn't really matter), it'll run on Windows Azure. The book has a chapter on how to do this with PHP examples. I recently did a talk on how to do RoR on Azure http://www.sriramkrishnan.com/books_talks.html http://www.sriramkrishnan.com/books_talks.html. Folks have run Python, Erlang, Clojure, etc on Azure without any issues. The thing to watch out for is that Azure doesn't come installed with these runtimes so you need to package them with your app or install them on the fly inside your VM.