zimbra? http://www.zimbra.com/ http://www.zimbra.com/ Community (open source) edition: http://www.zimbra.com/community/ http://www.zimbra.com/community/ Not e

zimbra? http://www.zimbra.com/ http://www.zimbra.com/ Community (open source) edition: http://www.zimbra.com/community/ http://www.zimbra.com/community/ Not exactly a "cloud based email client" in that it is an email server (you provide the cloud or use someone else's cloud) that has a web-based client.