Have you added the file server role from 'Manage your server'?

You'll need to do that for Print Server too.
I'd suggest 2008/2011 SBS.
Very easy to use, provides all the same functions of a normal server but with a Wizard to set it all up and comes with Exchange email
Don't forget to add in extra Shadow Copies so you have more than the default 7am and 12noon Shadow Copies
Edited: Don't want the feds seeing that bit