There doesn't seem to be any published requirements to install 3CXPhone for Windows (v12), so I'm hoping XP can meet the requirements. Any time I try to install on an XP computer I get "cannont be installed on systems with .NET Framework version lower than 4.0". So I think no problem I'll get on our WSUS server and push .NET Framework 4.0 to all of our XP clients. Unfortunately after .Net 4.0 is installed I'm still getting the same error. :x What is the problem? Is there some other requirement that we aren't meeting?!?