Need recommendation

[Tony Reeves]

I need some help in recommending a setup for a department here. 
We have a area that has a Sun SPARC 1+ and several other Suns also. 
They also have 20 IBM AT's (286 machines) and several Apple Mac's (II's I
think). What I need to do is this: I want to use the Sun SPARC 1+ as a hub to
allow the IBM and Mac user access to print on the Unix printers. Also the
ability to send and receive Email between the Sun users and the IBM and Mac
users. 

Can anyone recommend software for this? Does anyone know if PCNFS allows PC's
to print files (transparently) to unix printers? Can TOPS do Email from a Sun
to a IBM?

Any help please?