Do you use SCOM 2007 or SCOM 2007 R2 to monitor your environment? Are you planning to upgrade to SCOM 2012? if yes this tool will help you size your future solution.
Read more at source: http://blogs.technet.com/b/momteam/archive/2012/04/02/operations-manager-2012-sizing-helper-tool.aspx
Cheers,
Anderson Patricio
http://blogs.msexchange.org/patricio
Twitter: @apatricio