Zimbra 8.0 upgrade from Zimbra 7.2 on CentOS 6.x quicky

Woot Woot. The rather well done Zimbra Collaboration Server ("enterprise-class email, calendar and collaboration solution") has a major version change from 7.2.1 to version 8.0.0! We choose to run the Zimbra Collaboration Server Open Source Edition (OSE). We have previously upgraded through the 7.1 and 7.2 series with no issues. This is a brief overview of what needed to happen to get from 7.2.0 -> 8.0.0 on my CentOS 64-bit test server. I will take the production system from 7.2.1 -> 8.0.0 after a couple of weeks of random testing. I'm not crazy enough to just put a dot0 version in production. I may even wait a month to make sure enough bugs are worked through. I do have a job I want to keep ;)

Naturally, one should start by reading the very informative Zimbra 8.0.0 GA Release Release Notes. I am glad to see the "Inline reply", "Autocomplete matches now work correctly for Contact Groups" bugs fixed! The "Per folder message retention policy creation" added is long overdue IMHO. Don't short change your upgrade by skipping the release notes. You *should* take the time to go through it!

As root:

screen

tar -xzvf zcs-8.0.0_GA_5434.RHEL6_64.20120907144639.tgz

cd zcs-8.0.0_GA_5434.RHEL6_64.20120907144639

./install.sh --platform-override

To get the new 5 year default SSL cert, you will want to run as user zimbra:

sudo /opt/zimbra/bin/zmcertmgr createca -new

sudo /opt/zimbra/bin/zmcertmgr deployca

sudo /opt/zimbra/bin/zmcertmgr deploycrt self

Production server upgrade note (10/29/2012):
The Zimbra 8.0.0 upgrade/install seems to have reset several of my custom settings to default attributes! I have made most of my custom changes based on the very handy Zimbra wiki for Performance Tuning Guidelines for Large Deployments in the past. The main changed items I've spotted so far are zimbraImapMaxConnections and zimbraImapNumThreads that reverted back to 200. I hope not to find too many more production system oddities! The reason I noticed the issue is that the /opt/zimbra/log/mailbox.log had MANY messages like:
WARN  [ImapServer-76] [] imap - Dropping connection (max connections exceeded)
WARN  [ImapServer-80] [] imap - Dropping connection (max connections exceeded)