My startup is in Bizspark and uses Azure. (http://stackify.com http://stackify.com) We looked at AWS vs Azure and decided on Azure due to its PaaS capabilities.

My startup is in Bizspark and uses Azure. (http://stackify.com http://stackify.com) We looked at AWS vs Azure and decided on Azure due to its PaaS capabilities. It has its quirks like anything done. Their support is fantastic. We have two local evangelist type reps, a local sales rep, and have talked to many people through their tech support. Even exchanged emails with their developers and management. I really like their SQL federations and table storage. Both are designed for massive scale. Although they don't have a true NoSql solution, you can accomplish most things you would want NoSql for with those two options. I do wish they would allow secondary indexes on their table storage. It is possible to use VMs on Azure and use MongoDB or some other product. But part of the reason we chose Azure is we don't want to administer any of that junk. Good news about Azure is they use the platform internally which will continue to drive it's innovation.