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Small Business Server (SBS) is a line of server operating systems targeted at small businesses by bundling the operating system with a number of other Microsoft products that would normally need to be purchased or licensed separately. The most notable inclusions are Exchange, SQL Server, SharePoint and ISA/TMG (Microsoft's firewall and proxy server).
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ipconfig /registerDNS
This will register the ip address and computer name of your file server in DNS and the other machines should be able to find it. If not then check to ensure the Host A record for your file server is present in DNS, if it is not then manually add it in and try pinging again. If you are still unable to ping your file server then ensure you are allowing ICMP into the portion of the network the file server resides on. If you could give a brief description of your set up it would help as well.