If you want to use a Capacity Planning tool you can use this one
Office Communications Server 2007 R2 Capacity Planning Tool
http://www.microsoft.com/downloads/details.aspx?familyid=F8CBDDD6-7608-4BBE-9246-16E96C62BEF4&displaylang=enThe Office Communications Server 2007 R2 Capacity Planning Toolkit provides a set of tools and documentation to simplify capacity planning for Office Communications Server 2007 R2. The Capacity Planning Toolkit can be used as a complement to the Microsoft Office Communications Server 2007 R2 Planning Guide.
This release of the Office Communications Server 2007 R2 Capacity Planning Toolkit contains tools and documentation to simplify your hardware planning, provide you with increased knowledge and best practices for performance tuning, and improve your ability to verify the performance of your intended Office Communications Server 2007 R2 deployments.
The Capacity Planning Toolkit is intended for use by IT professionals in a test environment prior to production deployment. These tools should never be used against a live production environment.
- Belgian Unified Communications Community : http://www.pro-exchange.be -