In the SBS 2003 server have been replaced 2 network cards.
The first was used to connect to the Internet, second for the LAN connection.
First I ran the wizard to change the IP address, then I started guide to the Internet connection settings - both ok.
Server is currently connected to ineternet, workstations can log in with access to Internet and MS Exchange (on sbs).
The problem is that workstations can not connect to shared folders on the server and can not connect to shared printers.
I discovered a potential problem in Settings> Routing and Remote Access> IP Routing> General> Internal> functionless - I suppose this would be internal guidelines of working.
Thanks for the advice