After doing some testing on the recently released Zimbra Appliance version 8 I decided it was good enough to make the step from my current Zimbra Appliance running version 6.0.14 to the newly release version 8.0.0_GA_5434 (build 20120907144730). Although announced there is no version of the Appliance for Zimbra 7.
The most important thing for me was the availability of the Active Sync (EAS) feature in this release for my mobile devices. A quick test with my HP Pre3 showed it works flawless. It appears EAS protocol version 12.1 is used, so HTML mail is supported. This was not the case with the previous Zimbra Appliance release where I had the make use of the Z-Push connector to enable HTML mail on my webOS devices.
I have described the installation steps below. As a prerequisite have VirtualBox 4.1 installed.