Sorry for the delay.
So, I've done some testing.
First, I tried to restore a backup of my real home-server to a virtual machine. This procedure has worked countless times before. Now it doesn't. I didn't bother to even examine logs, cause the next logical step was to install a fresh virtual server and make a backup to restore.
Whaddayaknow, from a fresh 2.0.3 install to complete updated version, Zarafa now does not work at all.
Maybe I'm in a bad mood, but for me this is the final drop. I'm not even going to bother to try to make it work. I've had it with the endless string of bugs and modifications. I deeply regret (and have for a long time) ever deploying it. I can't count the man-hours it has cost constantly adjusting to a moving target.
(I wrote a page with detailed frustrations here, but decided to remove them, as they didn't add anything constructive.)
So basically what this means it that I will remove the how-to from the front-page, add a warning that it cannot longer be used, but still let people who want to read it (if they want to try additional adjustments themselves.)
This is not meant as a criticism of Zentyal per se, I'm sure it is useful for the majority of people/businesses out there, but for me personally I feel it does not suit my needs nor the needs of the people I do some work for.
I'm sorry for being unable to help, I'm sorry for withdrawing the how-to, but I cannot justify spending even more time trying to fix stuff.
Again, deeply sorry, and best of luck with Zentyal. Perhaps they have an updated backup and restore guide for you.
::Trym, over and out.