Comparison of Postfix and Vamsoft ORF

Our company has a limited support staff and they mostly know
Windows/Exchange only. We implemented a test of postfix and it worked
wonderfully (just doing recipient validation for now). This Windows
group now has tested Vamsoft's ORF for the same functionality. For this
initial test of recipient validation, both work fine.

Has anyone put together a comparison of the two identifying the extended
capabilities of each? I'll create it myself if it hasn't been done before.

thanks
john