Application Compatibility Toolkit (ACT) 4.1 download linkhttp://blogs.technet.com/b/jhoward/archive/2005/11/21/414871.aspxBoy, things can move fast when you're busy keeping a close eye on other technologies, hence I didn't spot this one released onto the web - version 4.1 of the ACT is available for free download here .en-GBTelligent Evolution Platform Developer Build (Build: 5.6.50428.7875)