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"A new report from Forrester presents a cost analysis of cloud-based email systems in enterprises, such as Google Apps or Yahoo!'s Zimbra. In the report, Forrester argues that cloud-based email services are cheaper than running email on-premise for all companies with less than 15,000 employees. What's more, Google Apps is significantly cheaper than both on-premise solutions and other cloud-based email services - even for very large enterprises. This could spell trouble for Microsoft, as we explain below."