Microsoft has released the Office Communications Server 2007 R2 Capacity Planning Tool. The Capacity planning and load simulation toolkit is for Office Communications Server 2007 R2 and can be using for planning and sizing situations together with the 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.
Download it here.