[phoenix]

Originally Posted by loopietky

In that case, it seem I have to migration from the open source 4.5.7 GA FC5 to NE 4.5.7 for Redhat or Ubuntu 6.06 TLS. Then do an upgrade to 5.0.

Network Edition Moving from Open Source to Network Edition ZCS - Zimbra :: Wiki

Yes, that would be the route to take.