Which version do you plan on running? v4 or v5? v4 should run fine. v5 would be slow to configure but should run OK once set up. The only issue is that the reason to go to v5 would be it's additional reporting, spam/virus capability, and IDS/IPS. All of which would bring this machine to its knees. It can only hold 256MB of RAM which is the minimum for v5 but is great for v4