Sizing your server is a little different. There are a number of factors to consider including number of concurrent connections, application requirements, server functions, etc. The minimum amount of memory I would use for any server is 512MB, and then add memory from there based on vendor recommendations. It's a bit dated, but there's a great book excerpt from "Tuning and Sizing NT Server" available on Technet at: http://www.microsoft.com/technet/archive/winntas/maintain/instant.mspx.
Also see my memory guide for reference: Learning Guide: Troubleshooting computer memory.
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