http://blogs.technet.com/b/chitpro-en/archive/2009/07/29/are-my-pc-s-capable-of-running-windows-7.aspxYou can assess your existing PC hardware compatibility with Windows 7 requirements and do this network-wide with the free Microsoft Assessment and Planning (MAP) Toolkit 4.0 for Windows 7. More information here and the same toolkit can do Server readinessen-USTelligent Evolution Platform Developer Build (Build: 5.6.50428.7875)