What is the newest agent that will support Windows Server 2003?

I know, I hate even asking the question.  Old physical servers bringing me down.

Hello, 

Our DL4300 appliance running Rapid Recovery Core 6.1.3.100 backs up our modern physical servers and also an ESXI box running our legacy servers after a P2V conversion. One of these VMs on ESXI is a Windows Server 2003 R2 32bit OS running SQL 2000…