moving from windows 2 k server to mac server same services and ips new box

hi have a windows 2k server i want to replace with a mac mini running server 10.4.7 i basically want to port the settings and accounts from the 2 k running crap entourage to mac mail or keiro . does anyone have a good way to do this or know of resources i want all the accounts to stay active and will set up the same setting for the mini to runt he same services the old 2 k box was doing . just some file sharing and mail services . thanks