Express Edition – The free Express Edition is perfect for people that need to get a community up-and-running on a budget. It is free, but has restrictions on use but can be used commercially.
Standard Edition – The Standard Edition is the entry level commercial platform and unlocks some features not available in the Express Edition.
Professional Edition – The Professional Edition is targeted at organizations that require many of the capabilities offered by Community Server 2.0 for running a high-traffic community.
Enterprise Edition – The Enterprise Edition unleashes the full potential of Community Server and has been designed for organizations that require all of the capabilities found in Community Server.
详细请见http://weblogs.asp.net/RHoward/archive/2006/02/20/438609.aspx的描述
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