The official tool for capacity and sizing guidance for Operations Manager 2007 is System Center Capacity Planner, which is due out in the second half of calendar 2007. It is available now as a beta here . To download the beta, you will need a Windows
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Read the complete post at http://blogs.technet.com/momteam/archive/2007/04/27/opsmgr-2007-performance-and-sizing-guide.aspx