[ubuntu] Building a office network

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http://ubuntuforums.org – I need to set up a small office network that will consist of the following: 10 laptops and desktop running windows 7 1 desktop machine running Ubuntu desktop 12.04 I want all the windows 7 machines to be connected with ubuntu desktop, all i want is ubuntu desktop as a internet server, internet access will be directly coming to the ubuntu desktop and output lan to the router so user can access internet as per rules, (bandwidth, site block etc) as the ISA server having these function. Also i want to share hard drives for HR and Finance department. I want don't want to go with the server (Hardware)