This product is a drop in replacement for Microsoft Windows Server and provides the same kind of functionality at a fraction of the cost. Being based on open source software, there are no costs associated with number of users, upgrades etc. It has all the functionality required of a Network Server operating system including - User and Groups - File and Print Sharing - Automated backup of files on machines connected on the LAN - Email Server services - VPN Server Services - Network Gateway capabilities - Web Content Filter - Gateway level antivirus and many many more features: This software has a fully functional , easy to use web interface which makes day to day administration a breeze. Being based on Centos (Open Source version of Red Hat Enterprise Linux), this is very lightweight and will run on older hardware or a high end PC rather than a full fledged server class machine, thereby saving cost on hardware as well. Cost Quoted does not include hardware