My AC database resides on a HP MediaSmart Server EX470 (AMD 1.8GHz 64-bit Sempron processor) which runs Windows Home Server version 1.1. I believe this type of server is considered Network Attached Storage (or is it?). I have 5 desktop computers and a laptop running Vista. I would like to upgrade to V4 (currently running V3.7.15). Does anyone know if V4 is compatible with Windows Home Server and the HP Media Smart Server line. The AC downloader warns me that AC V4 is not compatible w Network Attached Storage.