Office network isn't only wires, it is also a set of services wich help clients copmuters work properly. - Firstly client need to connect and take settings. DHCP service via dhcpcd or udhcp will help. - Client need to resolve unique corporate domain names and caching external domain names - caching DNS service BIND helps. - Office networks needs to be secure from internet, but DMZ zones must be open - correct iptables configuration with filtering by mac can give safty and save money. - Officers need to communicate with each other by Jabber, TeamSpeak or e-mail. - They need virus protection of mail and even smb-shared files. Windows networks always must be ready for attack. - Internal web-applications or external web-site needs a hosting. LAMP (Linux, Apache, PHP, MySQL) as usual or something small like Lighttpd, CGI, SQLite? - When company needs to move to the terminal technology, usually all users softly can be moved to Ubuntu terminals, but in some cases virtualization software can help to still support Windows.