Microsoft (MSFT) will dominate the IaaS cloud space because it has one unbreakable competitive advantage called Office 365. Its predecessor Office, and now Office 365 – a more enterprise tailored version of Office – are the de-facto tools used for productivity. As such, selling Azure from within an already established infrastructure is only natural. Most importantly, no other IaaS has this advantage. As such, I predict that Azure will become the de-facto IaaS used by enterprises.