Microsft Server 2003 CA standard or enterprise

So im looking into building a Microsoft CA using window server 2003. What is really the defference between standard and enterprise for what i'm looking to do.

Source: http://social.technet.microsoft.com/Forums/en-US/exchangesvrdeploy/thread/6c277cfd-1015-4f87-8705-35936db6ef15

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