I have a SBS2003 with a HP 2600n installed on it. I am able to print from the server, the test page prints. From my computer, Windows 7 Pro, I am unable to print any document...
What would be your suggestions?!
This isn't really an answer but a statement of fact. This printer is a host based printer which means that it is cheaper and will give you all sorts of problems as it isn't really designed to be shared on a network oddly enough. One thing that I have done with this printer was to disable bi-directional communication which resolved some issues were we having.
I have had some luck using the HP universal print driver on both the server and client in this situation, you might want to give it a try.