I just came across a handy tool to calculate Return Of Investment (ROI) on Exchange deployment. Tool is developed by U-B Tech and available at free of cost to use.
Use U-BTech’s Exchange 2010 ROI tool to compare the costs of implementing Exchange 2003, 2007 and 2010 and try different cost variations including storage costs, hardware costs, licensing costs and more by just providing basic inputs.
Download: U-BTech’s Exchange 2010 ROI Tool
Here are screenshots:
You will get nice calculated comparative report in html file.
You can even customized the licensing and hardware cost.