Free up resources on server

Hi all

I have a server that is totally  maxed out

this is a HP ProLiant ML370 G4

 Windows Server 2003 Standard Edition
3.20 gigahertz Intel Xeon
16 kilobyte primary memory cache
2048 kilobyte secondary memory cache
64-bit ready
Hyper-threaded (2 total)
3584 Megabytes Usable Installed Memory


it performs the following rolls

D.C,
 exchange (also live exchange),
print server (for about 15 printers ),
file server,
 backup server (for Arc Serve. This is also managing backups for 4 extra servers )
 Manages scanners (about 10 scanners),
 all the usual stuff like DHCP, DNS, etc.
Also this server handles up to   40 remote desktop sessions for long periods of time
And could have 40 to 50 workstations accessing files and folders through VPNs
Also manages the smart UPS software for 5 servers
Manages all security systems for the company (EG: alarms, swipe cards on all doors in the company)
Also manages software for clock in  machines
also hosts several databases

 At the present time the company does not have the budget for a new server but I managed to free up
an old server

this is a Windows Server 2003 Standard Edition

Fujitsu Primergy TX200 S3,
Intel Xeon 1.6Ghz,
1Gb RAM


 as you can see I really need to take some pressure off the server
 I want to use this second  server for the best benefit to the customer

What would be the best to do here and what would be the best combination of rolls to move to the new server?

Thanks
Robbie