I recently purchased a 2.0 i7 Mac Mini server and have read a few posts about people wishing to install the Lion (non-server) OS on it. There appeared to be no resolution without some trickery. Using my C2D Air I downloaded 10.7.3 from the App store, viewed the install contents to grab the DMG, restored the DMG to a USB and installed onto the Mac Mini server. No issues - booted straight into the client OS and no complaints about installing on the Server hardware. I hope this assists others who were experiencing difficulties. I have installed 8GB of RAM and I find it rips along in Aperture. Very happy with the machine.