Microsoft’s newer Windows Azure cloud service edges out App Engine, taking a 10.2 percent share. Forrester surveyed 1,200 developers, but only about 50 of them were actually deploying to the cloud.

Google's cloud services, including Google Apps and Google App Engine, have been deemed secure under the SSAE-16 security certification, paving the way for secure enterprise use.

Amazon beat Google to the market with its cloud computing service in 2006. Google launched a preview release of App Engine in 2008, a tool that lets customers run their web applications on Google ...

For example, Google’s just-announced App Engine for Business offers a 99.9 percent uptime SLA (service-level agreement) — without resorting to strong-arm tactics.