I've a planned an upgrade to our mail system from ZCS 6.0.16 to 8.0.x in about 2 weeks. During the process I will be upgrading the 3 servers on Ubuntu 64bit 8.04 to 12.04. I've run through this upgrade twice with a demo license with no concerns except licensing. My question is going from 6.0.16 to 8.0.2 or whatever the current version is I know how licensing changes. Can someone who has done this, give me some insight how to deal with the licensing change to expect? Licensing requires activation?

Here is my how I did the upgrade. I'd appreciate any comments/feedback:

OS at 8.04, ZCS at 6.016 - upgrade ZCS to 7.2.2
OS at 8.04, ZCS at 7.2.2 - upgrade OS to 10.04
OS at 10.04, ZCS at 7.2.2 - upgrade ZCS 8.0.2 (for Ubuntu 10.04)
OS at 10.0.4, ZCS at 8.0.2 - upgrade OS to 12.04
OS at 12.04, ZCS at 8.0.2 - upgrade ZCS to 8.0.2 (for Ubuntu 12.04)