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For simplicity reasons, I am going to focus on the IT department, because of the size of the company. In a large enterprise network with a heterogeneous environment, it is uncommon to find PC’s running just one type of operating systems. An enterprise network is usually comprised of a client/server structure, and different operating systems can be found on each end. On the server side, with servers and mainframes serving the backbone of the network, the servers are usually running UNIX, Windows NT 4.0 and windows 2000 Server OS. Even within the network, there are Cisco switches and routers which are running Cisco IOS as the operating system. The routers and switches are responsible for segmenting the network and to route the network traffic more efficiently. The mainframe runs on UNIX and for a long period supported the email system for the company. The email database resided on