The situation is a little different in the cloud app platform (PaaS) market. Salesforce's (CRM) Heroku, long a major player, is given a market-leading 18% share. But AWS is close behind at 17%, and so are Microsoft's (MSFT) Windows Azure (14%) and Google's (GOOG) App Engine (13%). All other vendors are estimated to have sub-5% shares.
Altogether, Synergy thinks Amazon grew its IaaS/PaaS revenue by 55% Y/Y, outpacing the 46% growth seen by the overall market. Moreover, AWS' IaaS/PaaS revenue is believed to have eclipsed that of Microsoft, Google, IBM, and Salesforce combined.
Synergy thinks the traditional Web hosting market, which Rackspace remains well-exposed to, and which has been pressured by the IaaS market's rise, only grew 3% Y/Y in Q3.
Last week, Stanley Druckenmiller cited AWS and its disruptive impact on traditional enterprise IT as a reason for shorting IBM.