If you want to develop an e-commerce application, you will have to protect confidential customer data, such as credit cards, addresses, etc. over secure connections ( HTTPS, in many countries this is a legal requirement )., For this reason, you will need SSL support.
Azure Website does not support SSL for custom domains. However, they do support SSL for the DNS name .azurewebsites.net DNS. So if your DNS e-commerce application is, say, my-ecom-app.azurewebsites.net, then this is normal. Otherwise, I would not recommend the Azure Website solution yet (I am sure that SSL support for user domains on the Azure Website will be implemented).
Azure Cloud Services , on the other hand, has full SSL support for user domains.
One of the really good sites for testing Azure features and the development roadmap ScottGu Blog
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