其实，“云镜像”代表的服务并不罕见，这种技术早在多年前就已经非常成熟，但把这些服务跟邮件系统结合到是iCoremail企业邮箱的首创。要理解“云镜像”就得从“镜像”这个概念说起。那么，什么是“镜像”？
私有云的常见需求是创建标准的镜像、虚拟化和自动化。
With a private cloud, there needs to be support for creating standardized images, virtualization and automation.
在EC2上运行镜像还需要按照使用云的时间付额外的费用。
Running an image on EC2 requires an additional fee based on the amount of time spent in the cloud.
不过任谁都可以在云上对这些镜像进行免费测试，尝尝味道。
But anyone can test for free such an image on the cloud to get a taste of what it means. For example, a SugarCRM session looks like this.
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