Windows Small Business Server 2003 Remote Connectivity

I have a client who purchased a Dell server running WINDOWS SMALL BUSINESS SERVER 2003. Ther server runs speicalized Water & Sanitation software in application server mode.  The client needs to have 5 workstations connect via a VPN and Remote Desktop to the server to access this application.  We have configured the VPN.  We can connect up to two workstations to the Small Business server.  When we attempt to connect the third workstation we get an error message that a client connection is not available.  Upon further investigation I have found that WINDOWS SMALL BUSINESS SERVER has terminal services application mode disabled.  I believe remote desktop is limited to TWO simultaneous connections.  When the server is running WINDOWS SMALL BUSINESS SERVER is a there a way to remotely connect more than two workstations to the server desktop?  Microsoft Product Support seemed to think this could not be done.

I need to give my client a response today.  I'd appreciate a definitive answer on this.  Thanks!