see mac server on windows server

Wow, careful with all the information there, you're overloading us.

In what context? Browsing through something like network neighborhood (ha!), or direction connection through some other app? Are you trying to share files, or is there some other service? May we assume these two machines are on the same subnet? And when you say "Windows network", do you just mean the other computers on the network happen to be running Windows, or do you mean you have a Windows server that controls network services, like Active Directory or something?

For the record, I've never had to do anything special beyond enabling file sharing for Mac and Windows machines to coexist on one network.

 

I'm not very familiar with using Windows Server 2003, so I'm not sure precisely which directory you mean. However, if you're using a Windows tool, all it probably needs to do is be using the Windows (Samba) form of file sharing. In System Preferences -> Sharing, turn on Windows Sharing. Try connecting to the Mac from one of the Windows computers using the Mac's IP. See if that gets you anywhere.

 

What backup software are they using?

I'd simply ask your work if they would drop some money and get you a drobo and 2 1TB drives.